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So don't worry so much about how to use  had had  as a unit of grammar, they will come together naturally when you want to express the verb ' to have ' in the past perfect. Let's consider a different verb for a moment like  to want .
So the general rule is that may and might are usually interchangeable when talking about possible situations. However, there are a few differences in usage between may and might and itâs useful, especially if youâre writing for school, college, or work, to know when each is more appropriate.ome authorities on English usage state that itâs better to use may when you think the chances of something being the case are likely and to use might when it is unlikely (though in practice, this distinction isnât always clear-cut): They may visit Ireland in the near future.