Form and rules
How it works
May and might can both express present or future possibility: It may rain / It might rain.
Might can sound a little less certain in some contexts, but speakers often use the two forms with very little difference.
Use may not or might not for negative possibility.
May I...? is a polite or relatively formal way to ask permission.
Both modal verbs are followed directly by the base verb: may go, might be, not may to go or might goes.