Even though many people use "may" and "might" interchangeably, they actually have slightly different meanings. The word "may", for example refers to a possibility, while "might" conveys slightly more uncertainty. In the example "There are dark clouds in the sky. It may rain later", we use "may" because the dark clouds suggest the possibility of rain. The sentence "I'm sick but I might come to the party" uses "might" because it is not certain the person will go to the party. This means, you should use 'may' when there is some kind of a sign that predicts or indicates future happenings. You should use 'might' when expressing something a little more unlikely or uncertain.
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