could grammar

Meanings

1. 1phrasefixed phrase

   The rules for using the modal verb 'could' to talk about past ability, possibility, permission, or polite requests.

   Grammar: 'Could' is a modal: it never takes -s or -ed and is followed by a bare infinitive, as in 'could swim'.

   Patterns

   • could + base verb
   • could have + past participle
   • Could you + base verb?

   In 'could grammar', the key point is that 'could' never changes form.

   Learners often ask about could grammar when they study past ability.

   Could grammar also covers polite requests like 'Could you help me?'

2. 2phrasefixed phrase

   The use of 'could' for general past ability, meaning someone was able to do something at any time in the past.

   Grammar: Use 'could' for repeated or general past ability, but 'was able to' or 'managed to' for one specific success.

   Patterns

   • could + base verb
   • could not + base verb

   When I was a child, I could swim very fast.

   She could speak three languages before she started school.

   We couldn't see the stage from the back row.

3. 3phrasefixed phrase

   The use of 'could' with 'have' to say that something was possible in the past but did not happen.

   Grammar: The pattern is 'could have + past participle'; it often shows regret or a missed chance.

   Patterns

   • could have + past participle
   • couldn't have + past participle

   You could have told me you were coming.

   She could have won the race if she had trained harder.

   They couldn't have known about the problem.

4. 4phrasefixed phrase

   The use of 'could' in polite requests and suggestions, softer than 'can'.

   Grammar: Put 'could' before the subject in questions: 'Could you open the window?'

   Patterns

   • Could you + base verb?
   • Could I + base verb?
   • We could + base verb

   Could you pass me the salt, please?

   Could I borrow your phone for a minute?

   We could meet at six if that suits you.

5. 5phrasefixed phrase

   The use of 'could' to talk about present or future possibility that is not certain.

   Grammar: Here 'could' shows a weaker possibility than 'may' or 'might' in many contexts.

   Patterns

   • could + base verb
   • something could be + adjective

   It could rain later, so take an umbrella.

   This could be the answer we are looking for.

   Prices could rise again next year.

Common combinations

could have done something

I could have finished the report yesterday.

could you please

Could you please close the door?

could be worse

The weather is bad, but it could be worse.

as soon as you could

Please reply as soon as you could.

could hardly believe

I could hardly believe my eyes.

Synonyms and how they differ

can

Use 'can' for present ability or permission; 'could' is its past or more polite form.

might

'Might' suggests a slightly more distant possibility than 'could' in many sentences.

may

'May' is more formal than 'could' for permission and possibility.

Word family

can modal verb

the present-tense modal related to 'could'

Commonly confused: could grammar or can grammar?

Practice

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Write a sentence using “could grammar”, then check it and compare it with the examples above.

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