May & Might

May and Might are modal verbs that are used to show possibility.  They act like the word "maybe".  

This means the speaker is not sure of the outcome.

Example:

Tom:        Will you go to the party tonight?
Kathy:      Maybe.

OR

Tom:        Will you go to the party tonight?
Kathy:      I might go to the party tonight. May and Might are used in conditional sentences, especially the 2nd Conditional and the 3rd Conditional.

Example:        

• If I won the lottery, I might travel.  However, I don’t know for sure.  I might also buy a house.
  

The difference between may and might is that may is more
formal.