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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 is one of those auxiliary verbs that can also be used as an ordinary (main) verb. When have is used as an auxiliary verb, it helps us to form the perfect and perfect continuous tenses. Study the examples given below. 1  I have finished the report.