IELTS grammar: Collocations

A collocation is a combination of words that native speakers habitually use together, even though other logically equivalent combinations exist and would be perfectly understandable: "make a decision," not "do a decision"; "heavy rain," not "strong rain"; "pay attention," not "give attention." There's no derivable grammatical or logical rule behind most of these pairings — they simply have to be learned as fixed units, the same way vocabulary itself is learned, rather than reasoned through from first principles. This is specifically a Lexical Resource issue, not a Grammatical Range one, since a sentence using "do a decision" is entirely grammatical in the technical sense (subject, verb, object, all correctly formed) but is immediately recognisable to a native reader or listener as unnatural. This is exactly why collocation errors are so costly relative to how small they look on the page: they are one of the clearest, most immediate signals to an examiner that vocabulary is being used less naturally, even when every individual word chosen is technically correct and the sentence is fully comprehensible.

Verb-noun collocations are the single largest and highest-frequency category, and building a working command of them is the most efficient way to raise collocation accuracy across an entire essay, since a relatively small number of these pairings account for a large share of formal academic writing. "Make" pairs with "a decision," "a difference," "an effort," "progress," and "an impact." "Do" pairs with "research," "damage," "harm," "a favour," and "business." "Have" pairs with "an effect," "an impact," "an opportunity," and "a conversation." "Take" pairs with "action," "a risk," "responsibility," and "a decision" (as an alternative to "make"). "Conduct" pairs formally with "research," "a survey," "an investigation," or "an experiment" — a more academic register alternative to the plainer "do research." The specific difficulty here is that "make," "do," "have," and "take" all feel semantically similar and interchangeable to a learner reasoning from meaning alone, when in fact each one has a largely fixed, non-overlapping set of nouns it correctly pairs with.

Adjective-noun collocations form a second major category, and getting these right is often what separates writing that sounds native from writing that is merely accurate. "Heavy" pairs with "rain," "traffic," and "criticism," while "strong" pairs with "evidence," "opinion," and "economy" — swapping them ("strong rain," "heavy evidence") produces a sentence a native reader immediately flags as slightly off, even without being able to articulate exactly why. "High" pairs with "quality," "demand," and "risk," while "large" pairs with "number," "amount," and "population" — again with largely fixed assignments that don't reliably follow from meaning alone. "Strict" pairs with "rules" and "regulations," while "tight" pairs with "schedule" and "budget" — two adjectives that both mean something like "restrictive" but attach to almost entirely different nouns in standard usage. Building fluency here specifically means noticing, when reading model essays or academic sources, which adjective habitually accompanies a given noun, rather than assuming any semantically appropriate adjective will sound equally natural.