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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 .
You use has instead of have only in the third person singular. Depending on the conjugation, who you are referring to. Have is used when I, you, we, or they is the subject (I â¦have, you have, we have, they have). If the subject is he or she, has is used (he has, she has).