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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 .
An international phenomenon: The English use two fingers, which is really just the middle finger with his angry buddy-- and how they create a new English Channel between themselves-- My grandmother was the one who taught me how to. properly, Jersey girl that she was.