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A very common grammatical error is the misuse of “may and might”. Today in colloquial (casual) English, “might” is used for both. But that is not grammatically correct. A little grammatical background is in order.
Both ‘may and might” only express action or actions that are “possible”, but not “definite”, e.g., I think I may go to the movies this afternoon (not definite, but only “possible” action). I thought I might go to the movies last night (not definite, but only “possible” action on the day before).
“May and might” can only state possible action, and “possible action” in grammar is called the “Subjunctive Mood”. Wow. That’ll scare you!
On the other hand, to express “definite action”, is called the …