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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 .
Hast can either be used as a noun meaning haste, or second person conjugation of the verb haben meaning have. One should keep in mind the German verb zu hassen, which is to hate. Conjugation in the second person is du hasst, and while it is written with an additional s, it`s pronunciation râ¦.