TOEFL Vocabulary

Academic Collocations for TOEFL — 200+ Fixed Word Combinations

195 academic collocations organized by type. Mastering these fixed phrases improves reading speed, writing fluency, and the lexical resource score that ETS raters evaluate.

195 collocations · 6 categories · Meaning notes + academic example sentences

What Are Collocations?

A collocation is a combination of words that occurs together so frequently in natural language that proficient speakers recognize it as a fixed — or at least habitual — unit. Collocations are not idioms (which have non-literal meanings), but they cannot always be predicted from their component words either. For example, in academic English you conduct research (not do or make research), and you draw a conclusion (not make or take a conclusion).

Why collocations matter for TOEFL: TOEFL Reading passages are written in authentic academic English, which is dense with collocations. When you recognize familiar collocations, you process text faster and with better comprehension. In Writing, ETS raters assess "lexical resource" — their term for the range and accuracy of your vocabulary use. Using correct collocations signals genuine academic fluency rather than translated or approximated English.

How to study collocations: You cannot memorize collocations the way you memorize individual word definitions. They must be encountered repeatedly in context. The most effective approach is to read authentic academic texts (journal articles, textbook chapters), highlight unfamiliar collocations, and record them in a vocabulary journal with example sentences. For TOEFL Writing, choose three or four collocations per week and practice writing original sentences using each one.

Verb + Noun Collocations

40 collocations

These verb-noun pairs are among the most frequent in academic writing. Each represents a conventional combination — using the wrong verb (e.g., "make research" instead of "conduct research") marks text as non-native.

Collocation	Meaning Note	Academic Example
conduct research	To carry out a systematic investigation.	The institute has conducted research into the neurological effects of chronic sleep deprivation for more than a decade.
draw conclusions	To reach a judgment based on evidence.	It is premature to draw conclusions from a single study with a small sample size.
raise questions	To bring up issues for consideration or debate.	The unexpected results raised fundamental questions about the validity of the underlying theoretical model.
provide evidence	To supply factual support for a claim.	The researchers provide compelling evidence that early childhood nutrition has lifelong effects on cognitive development.
address an issue	To deal with or focus attention on a problem.	The paper addresses the issue of measurement invariance, which is often overlooked in comparative studies.
make assumptions	To accept something as true without proof.	Classical economic models make several simplifying assumptions about rational behavior that do not hold in real markets.
reach a consensus	To arrive at a general agreement.	Scientists have reached a consensus that the warming trend over the past century is attributable primarily to human activity.
pose a challenge	To present a difficult problem or obstacle.	The rapid pace of technological change poses a significant challenge to existing regulatory frameworks.
offer an explanation	To suggest a reason for something.	The authors offer a compelling explanation for the observed discrepancy between the two data sets.
formulate a hypothesis	To develop a testable explanation for an observation.	Before designing the experiment, the team formulated a precise hypothesis that could be either confirmed or refuted.
test a hypothesis	To carry out experiments to verify or disprove a proposed explanation.	The researchers designed a controlled experiment specifically to test the hypothesis under laboratory conditions.
collect data	To gather information for analysis.	Survey instruments were deployed to collect data from a nationally representative sample of 5,000 households.
analyze data	To examine collected information to find patterns or draw conclusions.	Two independent researchers analyzed the data to reduce the risk of interpretive bias.
present findings	To report the results of research.	The team presented its findings at the annual conference before submitting the manuscript for peer review.
challenge assumptions	To question beliefs taken for granted.	Feminist scholarship in the 1970s began to challenge assumptions about the universality of the Western philosophical canon.
acknowledge limitations	To recognize the weaknesses of a study or argument.	The authors acknowledge the limitations of their cross-sectional design, which cannot establish causal relationships.
cite evidence	To refer to facts or research as support.	The policy brief cites evidence from 14 peer-reviewed studies to support its recommendations.
examine the relationship	To investigate how two variables are connected.	The study examines the relationship between neighborhood walkability and rates of type 2 diabetes.
explore the possibility	To investigate whether something may be true or feasible.	Future research should explore the possibility that the observed effect varies across different cultural contexts.
establish a link	To demonstrate a connection between two things.	Decades of epidemiological research have firmly established a link between tobacco use and lung cancer.
raise awareness	To increase public knowledge of an issue.	Public health campaigns aim to raise awareness of the early warning signs of cardiovascular disease.
implement a policy	To put a policy into effect.	Several countries implemented a carbon tax policy in the early 2000s with measurable effects on emissions.
adopt an approach	To choose and use a particular method or strategy.	The research team adopted a mixed-methods approach to capture both quantitative trends and qualitative insights.
draw a distinction	To identify a meaningful difference between two things.	It is important to draw a clear distinction between correlation and causation when interpreting observational data.
play a role	To be involved in or contribute to something.	Diet plays a significant role in determining an individual's long-term cardiovascular health outcomes.
gain insight	To develop a deeper understanding of something.	Longitudinal studies allow researchers to gain insight into the developmental trajectories of children over time.
take into account	To consider a factor in analysis or decision-making.	Any assessment of the policy's effectiveness must take into account the socioeconomic context in which it was implemented.
bridge the gap	To reduce a difference or fill a missing space in knowledge.	This study aims to bridge the gap between laboratory findings and their application in clinical settings.
shed light on	To clarify or help to explain something.	New archaeological discoveries have shed light on the trade networks of Bronze Age Mediterranean civilizations.
hold true	To remain valid or applicable.	The principle holds true across a wide range of experimental conditions and sample populations.
yield results	To produce findings or outcomes.	Early trials yielded promising results, but larger randomized controlled studies are needed for confirmation.
undergo change	To experience a transformation.	The discipline has undergone significant change since the introduction of computational methods in the 1990s.
draw on	To make use of a source or resource.	The analysis draws on data collected from three continents over a period of 15 years.
build on previous work	To extend or develop earlier research.	The current study builds on previous work by incorporating a more diverse sample and a longer follow-up period.
reach a conclusion	To arrive at a judgment after consideration.	After reviewing all available evidence, the committee reached the conclusion that the drug posed an unacceptable risk.
pose a threat	To represent a danger or risk.	Antibiotic-resistant superbugs pose a serious threat to the future effectiveness of modern medicine.
foster understanding	To encourage the development of deeper comprehension.	International exchange programs foster mutual understanding between students from different cultural backgrounds.
address a gap	To deal with an absence or deficiency in knowledge.	The study addresses a significant gap in the literature on the long-term effects of early childhood interventions.
produce results	To generate outcomes or findings.	The new protocol produced results consistent with those obtained using the gold-standard methodology.
assess the impact	To evaluate the effect of something.	The report assesses the economic impact of climate change on agricultural productivity through 2050.

Adjective + Noun Collocations

40 collocations

These adjective-noun pairings are conventional in academic discourse. Note that the "wrong" adjective is not necessarily incorrect — but it sounds unnatural to proficient readers of academic English.

Collocation	Meaning Note	Academic Example
significant factor	An important element that influences an outcome.	Parental education level is a significant factor in predicting children's long-term academic achievement.
crucial role	An extremely important function.	Mycorrhizal fungi play a crucial role in facilitating nutrient uptake in the majority of terrestrial plant species.
fundamental principle	A core, foundational rule or truth.	Conservation of energy is a fundamental principle that applies to all known physical processes.
broad consensus	Widespread agreement among many people.	There is a broad consensus in the scientific community that climate change represents a serious global risk.
growing body of evidence	An increasing amount of supporting research.	A growing body of evidence suggests that gut microbiota influence neurological function through the gut-brain axis.
critical issue	A highly important problem requiring urgent attention.	Access to clean water is a critical issue for more than two billion people worldwide.
key finding	The most important result or discovery of a study.	A key finding of the research was that the intervention was significantly more effective in younger participants.
primary objective	The main goal of a study or project.	The primary objective of the trial was to determine whether the drug reduced the risk of stroke by at least 20 percent.
compelling evidence	Strong, persuasive proof.	The prosecution presented compelling evidence that the defendant had knowledge of the fraudulent transactions.
extensive research	A large amount of systematic investigation.	Extensive research over the past two decades has documented the adverse health effects of particulate air pollution.
strong correlation	A high degree of statistical association between two variables.	There is a strong correlation between neighborhood socioeconomic status and school performance outcomes.
major challenge	A significant difficulty that requires substantial effort to overcome.	One of the major challenges facing renewable energy is the intermittent nature of solar and wind generation.
clear distinction	An obvious and important difference.	Economists draw a clear distinction between nominal and real interest rates when assessing monetary policy.
limited evidence	A small amount of support that does not yet allow firm conclusions.	Despite widespread public interest, the limited evidence available does not yet support the routine clinical use of this supplement.
robust methodology	A methodologically sound and reliable research approach.	The study's robust methodology, including pre-registration and blinding, significantly strengthens confidence in the results.
inherent limitation	A restriction that is part of the nature of the approach.	An inherent limitation of observational studies is their inability to establish causal relationships with certainty.
profound impact	A deep and far-reaching effect.	The invention of the printing press had a profound impact on the spread of literacy and religious reform.
rapid growth	Very fast expansion or increase.	The rapid growth of e-commerce has dramatically altered the retail landscape over the past two decades.
substantial evidence	A large and convincing amount of proof.	There is now substantial evidence that regular physical exercise reduces the risk of depression and anxiety.
complex relationship	A multifaceted, non-straightforward connection between things.	The complex relationship between income inequality and social mobility resists simple policy solutions.
direct consequence	An immediate result that follows from a cause.	The collapse of fish stocks was a direct consequence of decades of unregulated industrial fishing.
equal importance	Equivalent significance.	Both dimensions of the problem deserve treatment of equal importance in any comprehensive policy response.
adverse effect	A negative or harmful outcome.	The medication produced adverse effects in approximately 8 percent of participants in the clinical trial.
consistent results	Findings that are the same or similar across multiple tests.	The consistent results across multiple independent studies increase confidence in the validity of the conclusion.
underlying cause	The fundamental reason something occurs.	Identifying the underlying cause of the phenomenon required an interdisciplinary research approach.
contemporary debate	A current, ongoing argument or discussion.	The findings contribute to the contemporary debate about the appropriate role of standardized testing in education policy.
dominant theory	The prevailing or most widely accepted explanation.	The dominant theory held for two decades was overturned by the unexpected results of the replication study.
ethical concern	A worry about the moral implications of an action.	The use of CRISPR to edit human germlines raises profound ethical concerns about unintended heritable consequences.
empirical data	Information derived from observation and experiment.	The argument is not purely theoretical — it is supported by extensive empirical data from field studies.
theoretical framework	The conceptual structure within which research is conducted.	The study is grounded in a social constructivist theoretical framework that views knowledge as culturally produced.
positive outcome	A beneficial result.	Early intervention programs for at-risk youth have been shown to produce positive outcomes across multiple domains.
ongoing debate	A discussion that is still taking place.	The precise mechanism of long-term memory consolidation remains a subject of ongoing debate in neuroscience.
initial findings	Preliminary results at an early stage of research.	Initial findings were encouraging, but the researchers cautioned that replication in a larger cohort was necessary.
societal implication	A consequence for the wider community or culture.	The automation of knowledge work has significant societal implications for employment and income distribution.
economic impact	The effect on financial systems or prosperity.	The economic impact of the pandemic was unevenly distributed, disproportionately affecting low-wage workers.
natural phenomenon	An event or process that occurs in the natural world.	Tidal bores are a natural phenomenon in which incoming tides produce large waves in river estuaries.
innovative approach	A new or creative method of dealing with a problem.	The researchers developed an innovative approach to measuring neuroplasticity that does not require invasive procedures.
long-term effect	A consequence that persists or develops over an extended period.	The long-term effects of low-level lead exposure on cognitive development were not recognized until decades of research had accumulated.
potential benefit	A possible advantage that may be gained.	The potential benefits of the treatment must be weighed carefully against its known risks and side effects.
global trend	A pattern of change occurring across the world.	Urbanization is a global trend with profound implications for energy consumption, public health, and social organization.

Adverb + Verb Collocations

30 collocations

These adverb-verb pairings are the intensifiers and qualifiers of academic writing. They help you express degrees of certainty, extent, and frequency with precision — crucial both for reading comprehension and for writing with academic register.

Collocation	Meaning Note	Academic Example
largely determine	To be the main factor in deciding an outcome.	Early educational experiences largely determine a child's subsequent attitude toward learning and intellectual challenge.
significantly affect	To have an important influence on something.	Changes in land use significantly affect water retention, flooding frequency, and groundwater recharge rates.
consistently demonstrate	To repeatedly show the same finding across studies.	Longitudinal research consistently demonstrates that early childhood interventions produce measurable returns well into adulthood.
clearly indicate	To show unmistakably.	The trend data clearly indicate that the intervention's benefits diminish after two years without booster sessions.
substantially increase	To grow or cause to grow by a large amount.	Improved crop varieties have substantially increased yields in many developing regions without additional land use.
broadly reflect	To represent or mirror in a general way.	The sample broadly reflects the demographic composition of the adult urban population.
fundamentally alter	To change in a basic, far-reaching way.	The discovery of DNA's structure fundamentally altered biological research by providing a molecular basis for heredity.
directly influence	To have an immediate effect on something.	Sleep quality directly influences cognitive performance, mood regulation, and immune function.
profoundly shape	To have a deep and lasting influence on.	Childhood experiences of poverty profoundly shape neurological development and long-term health outcomes.
rapidly expand	To grow very quickly.	The field of genomics has rapidly expanded since the cost of sequencing fell below $1,000 per genome.
strongly suggest	To point persuasively toward a conclusion.	The pattern of results strongly suggests that the effect is not an artifact of the measurement instrument.
gradually decrease	To become smaller in amount or intensity over time.	The population gradually decreased as climate change made the island's water resources unreliable.
effectively address	To deal with successfully.	No single policy intervention can effectively address the multifactorial causes of urban poverty.
dramatically reduce	To lower greatly in amount or extent.	Widespread vaccination has dramatically reduced the incidence of several diseases that once killed millions annually.
increasingly recognize	To become more and more aware of or give credit to.	Researchers increasingly recognize the importance of replication studies in establishing reliable scientific knowledge.
heavily influence	To exert strong pressure on or have a major effect on.	Cultural values heavily influence which disorders are recognized, labeled, and treated in any given society.
positively correlate	To be statistically associated in the same direction.	Investment in early childhood education positively correlates with long-term economic productivity at the national level.
negatively impact	To harm or reduce the quality of.	Chronic noise exposure negatively impacts sleep quality, cognitive function, and cardiovascular health.
adequately explain	To account for sufficiently.	No existing theory adequately explains why some populations are far more vulnerable to the disease than others.
thoroughly investigate	To examine in complete and careful detail.	The hypothesis has not been thoroughly investigated in non-Western populations, limiting its generalizability.
extensively document	To record in detail, usually over a large range.	The adverse effects of this compound have been extensively documented in both animal models and human studies.
sharply contrast	To be very different in a striking way.	These findings sharply contrast with those of earlier studies, suggesting a possible cohort effect.
partially explain	To account for some but not all of a phenomenon.	Socioeconomic differences partially explain the gap in health outcomes between urban and rural populations.
universally accepted	Agreed upon by everyone in a field.	The germ theory of disease is universally accepted as the foundation of modern clinical medicine.
accurately predict	To forecast correctly or with precision.	The model can accurately predict outcomes for populations similar to the training data but generalizes poorly to new contexts.
widely regarded	Considered by most people or experts.	The discovery is widely regarded as one of the most important advances in the history of molecular biology.
consistently outperform	To perform better than a comparison group repeatedly.	Schools adopting collaborative learning models consistently outperform those using traditional lecture-based instruction on standardized assessments.
gradually diminish	To slowly become smaller or less important.	The effect of the intervention gradually diminished over the 24-month follow-up period.
effectively demonstrate	To show conclusively.	The experiment effectively demonstrates that the two variables interact in a non-linear manner.
actively contribute	To play a direct and energetic part in producing an outcome.	Residents who actively contribute to community organizations report higher levels of social trust and personal well-being.

Hedging Language

25 phrases

What is hedging? Academic writers use hedging language to qualify claims, acknowledge uncertainty, and avoid overgeneralizing. TOEFL Reading passages are full of hedging language — phrases like "evidence suggests that" or "it is generally accepted that." Recognizing these phrases is essential for answering inference questions accurately. In Writing, appropriate hedging demonstrates academic sophistication and is rewarded by raters.

Collocation	Meaning Note	Academic Example
it is generally accepted that	Most scholars or experts agree that.	It is generally accepted that the extinction of the dinosaurs was triggered by a combination of volcanic activity and an asteroid impact.
evidence suggests that	The available data points toward the conclusion that.	Evidence suggests that microbiome composition in early childhood may influence the development of the immune system.
it appears that	Judging from available information, it seems that.	It appears that the intervention is most effective when delivered in the first 12 months of life.
it is argued that	Some scholars or commentators have proposed that.	It is argued that the transition to agriculture was not an unambiguous improvement in human welfare.
it may be the case that	This possibility cannot be ruled out.	It may be the case that the observed correlation is confounded by a third variable not measured in this study.
there is reason to believe that	There is some evidence supporting the idea that.	There is reason to believe that social capital plays a more important role in recovery than economic resources alone.
it is possible that	This outcome could potentially be true.	It is possible that the discrepancy reflects methodological differences rather than genuine variation in the phenomenon.
to some extent	Partially; in limited measure.	The results support the hypothesis but only to some extent, as the effect size was smaller than anticipated.
under certain conditions	In specific circumstances that may not always apply.	The compound is effective under certain conditions, specifically at low pH levels and in the presence of a cofactor.
in some cases	Occasionally; not universally.	In some cases, the immune system mounts an excessive response that causes more damage than the pathogen itself.
it remains unclear whether	This question has not yet been resolved.	It remains unclear whether the behavioral changes observed in the laboratory translate to real-world settings.
the data are consistent with	The findings do not contradict and may support.	The data are consistent with the hypothesis, but further studies are needed before a causal claim can be made.
this finding should be interpreted with caution	This result is preliminary or may have limitations.	This finding should be interpreted with caution given the relatively small sample size and short follow-up period.
further research is needed to	More investigation is required before conclusions can be drawn.	Further research is needed to determine whether these effects persist beyond the six-month evaluation window.
it has been suggested that	Some researchers or analysts have proposed that.	It has been suggested that cultural factors moderate the relationship between genetic risk and expressed psychopathology.
broadly speaking	In general terms; with some exceptions.	Broadly speaking, societies that invest more in public health tend to have better population health outcomes.
in theory	According to the principles of the model, if ideal conditions hold.	In theory, the policy should increase employment; in practice, implementation challenges may limit its effect.
it is worth noting that	This is an important observation that should be considered.	It is worth noting that the control group also showed significant improvement over the study period.
to a considerable degree	To a large extent.	Academic performance is, to a considerable degree, a product of the resources and expectations of the home environment.
preliminary evidence indicates	Early, non-definitive data point toward.	Preliminary evidence indicates that the therapy is well tolerated, but long-term safety data are not yet available.
it would appear that	Based on available information, it seems as though.	It would appear that the outbreak originated from a single source, though the epidemiological investigation is ongoing.
one interpretation is that	This is one possible way of understanding the finding.	One interpretation is that the divergent results reflect genuine population heterogeneity in treatment response.
the extent to which	The degree or amount that something happens or is true.	The extent to which early interventions translate into long-term gains depends heavily on subsequent environmental conditions.
it is not yet clear	The answer to this question is not established.	It is not yet clear whether the protective effect of the compound operates through a direct or indirect pathway.
under normal circumstances	When conditions are typical, without unusual factors.	Under normal circumstances, the immune system eliminates mutated cells before they develop into tumors.

Transition Collocations

30 phrases

Transition collocations connect ideas and signal logical relationships. Unlike simple transitions (however, therefore), these multi-word phrases carry more precise meaning and are essential for writing coherent academic arguments.

Collocation	Meaning Note	Academic Example
in contrast to	Used to highlight a difference from what has been mentioned.	In contrast to earlier models, the revised theory accounts for the non-linear relationship between the variables.
as a consequence of	Because of; as a result of.	As a consequence of rapid urbanization, traffic congestion and air pollution have become critical urban health issues.
with respect to	In relation to; regarding.	With respect to energy efficiency, the new design significantly outperforms all comparable models currently on the market.
in addition to	As well as; besides.	In addition to its direct economic benefits, the program has produced significant improvements in participants' mental health.
as a result of	Because of something mentioned previously.	As a result of increased greenhouse gas concentrations, average global surface temperatures have risen by approximately 1.1°C.
in terms of	With regard to the specific aspect mentioned.	In terms of biodiversity, tropical forests far exceed any other terrestrial biome on Earth.
in light of	Taking into account a piece of information.	In light of these findings, the authors recommend a revision to the current clinical guidelines.
in spite of	Despite; without being prevented by.	In spite of the methodological challenges, the research team produced highly reproducible results.
on the basis of	Using as evidence or reasoning.	The committee recommended approval on the basis of the safety and efficacy data submitted by the manufacturer.
in response to	As a reaction or answer to.	In response to mounting evidence of harm, the agency issued new guidelines restricting the chemical's industrial use.
by means of	Using a particular method or instrument.	The researchers measured gene expression by means of next-generation RNA sequencing.
in the context of	Within the particular circumstances or setting of.	In the context of global climate negotiations, the interests of small island states are often underrepresented.
regardless of	Without being affected by a particular factor.	The protocol must be followed regardless of the specific population or setting in which it is applied.
in accordance with	In a manner consistent with a rule or standard.	The study was conducted in accordance with the Declaration of Helsinki guidelines for ethical medical research.
in comparison with	Relative to; alongside for the purpose of assessing similarities or differences.	In comparison with last year's results, the current cohort demonstrated significantly higher scores across all subtests.
as opposed to	Rather than; in contrast to.	The study uses primary, firsthand data as opposed to relying on secondary sources assembled by others.
given that	Taking into consideration that.	Given that the sample was drawn entirely from a single institution, caution is warranted in generalizing the findings.
in order to	With the purpose of achieving something.	The protocol was revised in order to minimize participant attrition during the extended follow-up period.
as well as	In addition to; together with.	The study considers genetic factors as well as environmental exposures and lifestyle behaviors.
at the same time	Simultaneously; while also acknowledging a contrasting point.	The new treatment reduces tumor size; at the same time, it carries a risk of serious hepatic side effects.
on the contrary	Used to emphasize that something is the opposite of what was stated.	Rather than reducing innovation, regulation can, on the contrary, stimulate it by creating demand for cleaner technologies.
to the extent that	As far as; in proportion to.	The model is useful to the extent that its assumptions match the conditions of the real system being studied.
in particular	Especially; more than others.	In particular, the third hypothesis — concerning feedback effects — remains empirically contested.
on the other hand	Used to introduce a contrasting point.	Automation may reduce production costs; on the other hand, it displaces workers who lack skills to transition.
for this reason	Because of what has been stated.	The data were not normally distributed; for this reason, non-parametric statistical tests were applied.
in the absence of	When something is not present or available.	In the absence of long-term data, it is difficult to assess the sustainability of the observed gains.
over the course of	During the duration of a period of time.	Over the course of the five-year study, participant dropout reduced the effective sample size by 18 percent.
to date	Until now; up to this point in time.	This is the largest randomized controlled trial of its kind to date, involving more than 40,000 participants.
at this stage	At this point in the process or research.	At this stage, the evidence is insufficient to recommend changes to existing clinical practice guidelines.
in the long run	Over a long period of time; eventually.	Investments in education may be costly in the short term but are highly cost-effective in the long run.

Noun + Noun Academic Phrases

30 phrases

Academic writing makes heavy use of noun phrases — multi-word nominal constructions that compress complex ideas into compact expressions. These are some of the most common in TOEFL-level academic texts.

Collocation	Meaning Note	Academic Example
research methodology	The systematic approach and procedures used in research.	The paper's research methodology is described in sufficient detail to allow replication by independent investigators.
case study	A detailed examination of a single instance or event.	The case study of Finland's educational system has been widely cited as a model for reform.
data analysis	The process of inspecting and modeling data to discover useful information.	Data analysis revealed a non-linear relationship between dosage and therapeutic effect.
field experiment	A study conducted in a real-world environment rather than a laboratory.	The field experiment randomly assigned households to receive subsidized insulation, allowing a causal estimate of energy savings.
literature review	A comprehensive survey of published work on a topic.	The literature review identified 43 studies meeting the inclusion criteria, spanning two decades of research.
control group	A group in an experiment that does not receive the treatment.	Participants in the control group received standard care throughout the 12-week intervention period.
sample size	The number of participants or observations in a study.	The study's small sample size limits the statistical power and generalizability of the findings.
effect size	A quantitative measure of the magnitude of a phenomenon.	The effect size of 0.6 standard deviations is considered large by conventional benchmarks in educational research.
peer review	The evaluation of scientific work by experts in the same field.	All manuscripts submitted to the journal undergo double-blind peer review before an acceptance decision is made.
research gap	An area where knowledge is missing or insufficient.	The authors identify a significant research gap regarding the effects of the intervention in non-Western populations.
baseline measurement	An initial measurement taken before an intervention.	Baseline measurements of blood pressure and cholesterol were recorded for all participants at enrollment.
policy implications	The consequences of research findings for government or organizational policy.	The policy implications of these findings are significant: current dietary guidelines may need revision.
regression analysis	A statistical method for modeling relationships between variables.	A multiple regression analysis controlled for age, gender, and socioeconomic status in the final model.
meta-analysis	A quantitative synthesis of results from multiple independent studies.	The meta-analysis pooled data from 22 randomized trials involving more than 100,000 patients.
correlation coefficient	A statistical measure of the strength of a relationship between two variables.	The correlation coefficient between reading ability and socioeconomic status was 0.45 in the primary analysis.
standard deviation	A measure of the spread of values in a data set.	Scores ranged from 42 to 98, with a mean of 72 and a standard deviation of 11.4.
confidence interval	A range of values within which the true population parameter is likely to fall.	The 95 percent confidence interval ranged from 1.2 to 1.8, indicating a statistically significant positive effect.
follow-up study	A subsequent study to verify or extend the findings of an earlier one.	A five-year follow-up study confirmed that the benefits of the early intervention persisted into adolescence.
brain imaging	The use of scanning technologies to visualize the structure or activity of the brain.	Brain imaging studies have identified the neural correlates of working memory in the prefrontal cortex.
climate model	A mathematical simulation of the Earth's climate system.	Climate models project that global mean temperatures will rise by 2–5°C by 2100 under high emissions scenarios.
social media	Digital platforms enabling user-generated content and social networking.	Social media have transformed political communication by allowing direct interaction between politicians and citizens.
power dynamics	The distribution and exercise of power within a group or relationship.	The anthropologist analyzed the power dynamics within the organization by examining who controlled access to key resources.
knowledge gap	An area where understanding is incomplete or absent.	The researchers identified a critical knowledge gap regarding dose-response relationships at low levels of exposure.
decision-making	The cognitive and social process of selecting a course of action.	Stress impairs decision-making by reducing activity in the prefrontal cortex, the brain region responsible for executive function.
population growth	The increase in the number of people in a region over time.	Rapid population growth in sub-Saharan Africa is projected to place enormous strain on agricultural and water resources.
species diversity	The variety of species within a given community.	Species diversity is a key indicator of ecosystem health and resilience.
market competition	The rivalry between producers in a market.	Intense market competition drives down prices for consumers but may reduce profit margins below sustainable levels.
income inequality	Disparity in the distribution of income across a population.	Income inequality has risen in most OECD countries over the past four decades.
carbon emissions	The release of carbon dioxide into the atmosphere from burning fossil fuels.	Reducing carbon emissions requires systemic changes across energy, transportation, and industrial sectors.
research findings	The results or conclusions of a study.	Research findings presented at the conference challenged several assumptions embedded in current medical guidelines.

How to Use Collocations in TOEFL Writing

Don't overuse — be selective

Pick 3–5 collocations per essay and use them correctly rather than forcing in as many as possible. One precise collocation used correctly impresses raters more than five used awkwardly.

Know which category to use in which context

Hedging phrases belong in body paragraphs and conclusions. Transition phrases belong between paragraphs. Verb-noun collocations belong wherever you discuss research, data, or arguments.

Substitute them for weak alternatives

Replace 'This makes a big change' with 'This fundamentally alters the landscape.' Replace 'Studies show' with 'A growing body of evidence suggests.' The substitution signals academic register.

Practice in timed writing

Set a timer for 30 minutes and write an academic essay incorporating at least 5 collocations from this list. Review your essay to check for natural usage.

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