Could vs May vs Might

When to use each in English, with meaning, register, and examples.

Could

Top 1,000 (very common)A1

May

Top 1,000 (very common)A2

Might

Top 1,000 (very common)A2
 CouldMayMight
Pronunciation🇬🇧 /["/kəd//kʊd/","/ˈkʊdnt/"]/🇺🇸 /["/kəd//kʊd/","/ˈkʊdnt/"]/🇬🇧 /["/meɪ/","/ˈmeɪ nɒt/","/ˈmeɪənt/","/maɪt/","/ˈmaɪt nɒt/","/ˈmaɪtnt/"]/🇺🇸 /["/meɪ/","/ˈmeɪ nɑːt/","/ˈmeɪənt/","/maɪt/","/ˈmaɪt nɑːt/","/ˈmaɪtnt/"]/🇬🇧 /["/maɪt/","/ˈmaɪtnt/"]/🇺🇸 /["/maɪt/","/ˈmaɪtnt/"]/
Meaningused to express possibility or ability in the pastA month in spring.used to say something is possible or to suggest something
ExampleI could help you with your homework if you want.We may go to the park if it stops raining.You might want to bring an umbrella, as it looks like it might rain.
RegisterNeutralNeutralNeutral
How commonTop 1,000 (very common)Top 1,000 (very common)Top 1,000 (very common)
CEFR levelA1A2A2
Collocationscould have, could you, could not, could bein May, May flowers, May vacation, May day, May calendarmight consider, might want, might happen, might stay
Antonymscouldn't, can'tJune, Decembermust, should
Common mistakesConfused with 'can' for present ability instead of past., Omitting the base verb after 'could'., Using 'could' for future intentions instead of 'would' or 'will'.Confused with the auxiliary verb 'may', especially in questions., Incorrectly capitalizing 'may' when used in sentences as a verb., Saying 'in May month' instead of just 'in May'.Confused with 'may' - 'might' suggests less certainty., Used incorrectly with past verbs - should say 'might have been'.
Usage notesUsed to talk about ability, requests, and possibilities. Considered neutral; avoid in very formal writing.Use 'May' when talking about the month in a date or events, but do not confuse with 'might', which expresses possibility.Use 'might' to express possibility or suggestions in a polite way. It's less certain than 'may'. More common in spoken English. Avoid in very formal writing.

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Could

Frequently asked questions: Could vs May vs Might

What's the difference between Could, May, and Might?

Could: used to express possibility or ability in the past May: A month in spring. Might: used to say something is possible or to suggest something

Are Could, May, and Might the same CEFR level?

Could: A1, May: A2, Might: A2 on the CEFR scale.

Can you show an example of each?

Could: I could help you with your homework if you want. May: We may go to the park if it stops raining. Might: You might want to bring an umbrella, as it looks like it might rain.

Can I use Could, May, and Might interchangeably?

Not always. Could, May, and Might are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.