The terms often overlap in everyday usage. But to be strictly correct, can/could refers to ability or capacity to do something, while may/might refers to permission or possibility. I can drink a jug of water in ten seconds.
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Unsafety2No, they are not the same.Is the same?Are they the same?
Unsafety2When can I use 'might' or 'could'?There are various differences. The usages below show just how subtle these can sometimes be. It takes a lot of experience hearing and using these forms before you gain a mastery of them.