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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 .
have had / has had We typically use have as a main verb with an object to talk about common actions. There are lots of things that we have in English, meaning that we enjoy or experience them. For instance, we can: