Good question! I will try to answer this from my perspective as a native speaker of American English. Other native speakers *may* have different views on it. :) "May" and "might" are very similar, with some subtle differences. In most cases, they can be interchanged without changing the meaning of the sentence. For example: I might go to the store today. I may go to the store today. Both sentences indicate that there is a possibility that the speaker will go to the store. However, "may" seems objective (there is no emotion or feeling about it), and "might" seems slightly subjective. "I might go to the store" seems to indicate there is a desire to go to the store. "I may" sounds like it simply depends on other factors. Also, I feel that "might" indicates a slightly higher probability than "may." Here is another example: 1) If you do that, your father might get mad. 2) If you do that, your father may get mad. I will continue in a second post...