Could vs May

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
 CouldMay
Pronunciation🇬🇧 /["/kəd//kʊd/","/ˈkʊdnt/"]/🇺🇸 /["/kəd//kʊd/","/ˈkʊdnt/"]/🇬🇧 /["/meɪ/","/ˈmeɪ nɒt/","/ˈmeɪənt/","/maɪt/","/ˈmaɪt nɒt/","/ˈmaɪtnt/"]/🇺🇸 /["/meɪ/","/ˈmeɪ nɑːt/","/ˈmeɪənt/","/maɪt/","/ˈmaɪt nɑːt/","/ˈmaɪtnt/"]/
Meaningused to express possibility or ability in the pastA month in spring.
ExampleI could help you with your homework if you want.We may go to the park if it stops raining.
RegisterNeutralNeutral
How commonTop 1,000 (very common)Top 1,000 (very common)
CEFR levelA1A2
Collocationscould have, could you, could not, could bein May, May flowers, May vacation, May day, May calendar
Antonymscouldn't, can'tJune, December
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'.
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.

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Could
May

Frequently asked questions: Could vs May

What's the difference between Could and May?

Could: used to express possibility or ability in the past May: A month in spring.

Which is more advanced: Could and May?

May is the highest level, at A2, on the CEFR scale.

Are Could and May the same CEFR level?

Could: A1, May: 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.

Can I use Could and May interchangeably?

Not always. Could and May 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.

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