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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 .
Hyphens are used to join or separate words, in order to make their meaning clearer. There are several principle uses:to split words that are too long, at the end of a printed lineto separate letters in spelling (D-O-G) or syllables (syl-la-ble)to join prefixes (especially in the UK) where the meaninâ¦.