The modal verbs are auxiliary verbs used to express ability, possibility, permission, or obligation.
Might + infinitive
I/we/you/they/he/she/it + might (not) + infinite verb (e.g.: She might go to London).
I might = it´s possible that I will.
– He might go to the movies tonight, but he´s not sure (it is possible that he will go).
– I might play golf tomorrow (it is possible)
I might not = It´s possible that I will not.
– Paul might not come to the meeting (it is possible that he will not come).
– Anne might not go to Las Vegas tomorrow.
You can use may in the same way.
I may = I might
– I may go to New York City next weekend (I might go).
– Steve may not go to work tomorrow (it is possible that he will not go).
You can use may to express a desire
– May the force be with you!
– May the New Year bring you love.
Using may to ask for permission
– May I go to the restroom?
– May I have your attention, please?
– May I go out?
– May I open the window?
Using may to give permission
– You may have a glass of wine if you like.
– You may go to the restroom if you want.