What's the difference between can,could and may?
I'm an English learner,can you help me?
I'm from China,so I can't understand them...
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They all have unique meanings which a dictionary will tell you. However, they can be interchangeable in certain contexts.
"Can" indicates that something is a possibility eg. "I can go to the shops for you"
"Could" indicates a possibility that is perhaps dependent on something a condition eg. "I could go to the shops for you if I can borrow your car"
"May" can indicate an uncertain possibility eg "I may go to the shops today, or maybe tomorrow"
An example where "could" and "may" are interchangeable would be:
Q. Who is knocking at the door?
A. It could be my dad / It may be my dad