where we use may be and where might be ??

May is used to express permission.May not is used to deny permission. May I come in, sir?Yes, you may.May I go home now?No, you may not. Possibility May is also used to express possibility. It may rain.She may come.He may get good marks. May is also used in expressing a wish. May God bless you!May his soul rest in peace! May is used in subordinate clauses that express a purpose. Farmers use fertilizers so that they may have a rich harvest.We eat that we may live. Might Might is the past tense of may in indirect speech. He said, ‘I may stand for election.’He said that he might stand for election.Alice said, ‘I may come.’Alice said that she might come. Might and may Might shows less possibility thanmay.

Might (past form of may) Used to suggest a smaller possibility than may does (actually, might is more common than may in American English) : He might have finished it. I might go see a doctor. I might not come this time. It might be right. You might have lost it. The store might have been closed today.

May Used to ask for formal permission: May I come in? May I say something now? May I ask one question? Used to suggest something that is possible: She may agree with this plan.

"May" implies 50 percent possibility and "Might" implies 25 percent possibility. It may rain. It might rain. It may be true. It might be true.