As a general rule, "may" expresses a greater probability than "might" when referring to the future, even though usually there's little to no difference in meaning: I may be able to help you with that. I might be able to help you with that. But this subject is so broad that it would help us a great deal if you provided a sample sentence or context you would have problems with.
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MaroldAre there any differences between these two modal verbs when it comes to expressing the future?No. If you restrict the usage in that way, then the only difference is that 'may' is slightly more formal.
Maroldbasic grammatic rul