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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 .
They're. âTheyâreâ is a contraction of the words âtheyâ and âareâ (or less commonly, âtheyâ and âwereâ). The word there is usually followed by a verb ending in the letters âing (which is known as the present participle). Consider the following example sentences using the word âtheyâreâ: