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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 .
It is used with the base form of a verb. In spoken English, would is often abbreviated to 'd. 1 modal You use would when you are saying what someone believed, hoped, or expected to happen or be the case.