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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 .
The use of first, second, and third person creates the perspective or point of view of a piece of writing. Writing in first person uses the personal pronouns I, we, me, and us, and the possessive forms my, mine, our, and ours; while second person uses you, and the possessives your and yours..