may and might.It may rain. It might rain. What’s the difference? Just as could is the past tense of can, might is the past tense of may: We thought we might win the tournament. But might can also be used as a substitute for may to show diminished possibility. Thus, saying We might go to the movies means that the likelihood of going is somewhat less than if you say We may go to the movies. When used to express permission, might has a higher degree of politeness than may. Thus, Might I express my opinion conveys less insistence than May I express my opinion.
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may can / might could. In many Southern varieties of English, might is used in the “double modal” construction with could, as in We might could park over there. Less frequently, one hears may can and might should. These constructions are not familiar to the majority of American speakers and are best avoided in formal writing.
