No rule explains why it's 'make a decision' and 'do your homework.' You just have to have heard it enough times to know.
A collocation is two or three words that English speakers habitually put together, to the point where the pairing sounds like the only possible one – even though grammar would allow others. In most English, “decision” pairs with “make.” Formal British English also uses “take a decision”; “do a decision” is not standard. Usage settled those pairings, and exposure is still the best way to learn them.
The linguist J. R. Firth put a technical name on the habit in the 1950s, in a line that outlived most of his other work: you shall know a word by the company it keeps. Company is the right image. These words don’t show up alone. They arrive already paired with whoever they’re usually seen with, and a fluent speaker rarely has to think about it.
A learner can have excellent grammar and still choose a pairing fluent speakers rarely use. Here are twelve common combinations worth learning as units.
01 · Make, not do
make a decision
To choose what to do after thinking about the options.
She keeps walking up and down, trying to make a decision by five.
“Make” collects an oddly specific set of dependents: a decision, a mistake, an effort, progress, sense, noise. Nothing links them grammatically. They just travel with “make,” and “do a decision” sounds nonstandard to most speakers in a way no verb conjugation table would predict.
No rule explains it. You just have to have heard it enough times to know.
02 · Do, not make
do research
To look carefully for facts and information about something.
She's doing careful research before buying a used car.
“Do” runs the other half of the same household: research, homework, business, a favor. The guess that trips people up going this direction is “make research” – tidy-sounding, and simply wrong.
There’s no test for which tasks get “do” and which get “make.” Housework mostly takes “do” – the dishes, the laundry – except for one holdout. You still make the bed.
03 · Heavy, not strong
heavy rain
Rain that falls hard and in large amounts.
We got soaked walking three blocks in heavy rain last night.
Weather takes “heavy” for rain, snow and traffic. Wind and smell take “strong” instead, for reasons most native speakers would struggle to explain.
Both words mean roughly “a lot of it.” English still sorts them by noun, not by meaning, and expects you to have absorbed the sorting somewhere along the way.
04 · Deep, not heavy
deep sleep
Sleep so deep that small noises do not wake the person.
I was in such a deep sleep I never heard the alarm.
Sleep gets a third adjective. “Deep sleep” is the usual pairing; “heavy” more often describes the sleeper. The opposite of a deep sleeper isn’t a shallow one, either – English reaches for light sleeper instead, a completely different word doing the same job.
Three near-synonyms for “a lot” or “very” – heavy, deep, strong – and each has staked out its own set of nouns, with almost no overlap you could have guessed in advance.
05 · Raise, three ways
raise a child
To care for and teach a child until they are an adult.
She raised a child on her own while working two jobs.
“Raise” attaches to a child, to money and to your voice, and the three have nothing in common beyond the verb. Raising a child is decades of unglamorous work. Raising your voice is one bad minute in a meeting.
The verb doesn’t distinguish between them. It’s the same word whether the stakes are a lifetime or a single sentence.
06 · A piece of
a piece of information
A single fact or detail about something.
The witness gave us a piece of information we needed.
Information, advice, furniture, luggage, news and equipment are usually uncountable in English, so they do not normally take a plural. To count one unit, English often reaches for a measure phrase: a piece of information, an item of luggage, or a piece of equipment.
You cannot say “an information.” You can say “a piece of information.” The workaround became so standard it stopped feeling like a workaround at all.
07 · Catch, not get
catch a cold
To get a mild illness of the nose and throat, often with a cough.
I always catch a cold in the first week of a new school year.
You catch a cold the way you’d catch a ball you didn’t ask for – it happens to you, not because of anything done on purpose. The same verb turns up in “catch your breath,” another thing the body does without being told.
“Get a cold” isn’t wrong, exactly. It just loses the sense of something landing on you uninvited that “catch” was built to carry.
08 · Pay attention
pay attention
To watch, listen or think carefully about something.
I need everyone to pay attention for the next two minutes.
“Pay” does several jobs where no money changes hands: pay attention, pay a visit, pay someone a compliment. The word frames attention as something spent – and people notice when none is handed over.
09 · Lose, not have
lose your temper
To suddenly become very angry and show it.
Don't lose your temper with the guy on the phone.
You have a temper the way you have brown eyes, but “lose your temper” isn’t about the trait – it’s about the one moment control slipped. The same verb covers losing patience, for the same reason.
“Lose” here doesn’t mean the temper goes missing and might turn up later. It means it got away from you, briefly, in front of people.
10 · Made, never done
make progress
To move closer to finishing or improving something.
Is the team making any progress on the new app?
Progress belongs to “make,” same as decisions and mistakes – which is the useful part. Once the cluster is familiar, this stops being a separate fact to remember and starts being obvious.
Learn ten of these and the eleventh feels predictable. Learn one and it’s still just one.
11 · Set, not made
set a goal
To decide on a specific target to work toward.
She asked the team to set a goal before things got busy.
A goal gets “set,” not “made,” which puts it in company with an example and a table, of all things. English verbs organize by habit here, not by category – nothing links a fitness goal to a place setting except the word the language happened to reach for.
12 · Keep, not held
keep a promise
To actually do what someone has promised to do.
He's keeping a promise to his son, so he's driving six hours to the game.
A promise is kept or broken, rarely held – that’s reserved for hands and conversations. The same “keep” covers a secret, which suggests the language treats both as things you’re trusted not to let go of.
“Break a promise” reaches for the opposite verb entirely rather than an “un-keep.” Small proof, if any were needed, that none of this adds up to one tidy system.
None of the twelve above obey a rule that would let you predict the next one. That is the honest answer to why collocations are hard: not a grammar problem, an exposure problem. The fix is hearing – or reading – the real pairing often enough that the wrong one starts to sound off on its own.
The same is true of the common phrases that make up the rest of everyday English, and it’s most of why losing a Duolingo streak doesn’t actually cost you anything you can’t get back by reading a bit more. A widget that hands you one pairing a day won’t replace either. It’s just a smaller thing to keep up than a class, on days when a class is not going to happen.
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