Use modal verbs may and might to talk about possible activities or happenings in the future.
- I'm not sure I'll go to the party. I may be away.
- Don't drop by at 7:20 p.m. I might be watching TV.
- Please, prepare something to eat. Mr. Johnson might be hungry.
- We may not be able to go to school this week.
There isn't much difference between the two. So you can say:
- John might be at home or John may be at home.
- I may visit Mary or I might visit Mary.
Sentences formed with might are less likely to happen than those with may. For example:
- I may be away at 10 p.m. (35% likelihood)
- I might be away at 10 p.m. (20% likelihood)
Of course, these figures may vary depending on the situation.
However, when the situation is unreal, only might can be used:
- If I were a bit smarter, I might go to college. (The speaker won't become smarter, so the situation is unreal.)
If you're using the reported speech, may becomes might:
- "I may be late," said Frank. In reported speech: Frank said that he might be late.
So there are 2 important points about might
1-It is less likely and for more unreal stiuations.
2-In reported speech may changes to might