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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 .
Also use there with to be verbs. There plus a to be verb (be, is, am, are, was, were) indicates the existence of something, or mentions something for the first time.. Remember that they're is a contraction of the words they and are. It can never be used as a modifier, only as a subject (who or what does the action) and verb (the action itself). 1  They're my best friends. 2  I would go to the movies, but they're already waiting for me.