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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 was / were comes as the past tense of the verb âto beâ. That is, in the first person tense, one would say âI wasâ¦.â whereas in the second person one would say âyou wereâ¦.â. However, the exception to this comes with the subjunctive / conditional tense.