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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 term English tends to be used (more-or-less) for the period after the Norman conquest (1066), when England became a single political unit. The English were a mixture of Anglo-Saxons, Celts, Danes, and Normans.Anglo-Saxon gradually merged with Norman French to become a language called Middle English (Chaucer, etc.), and that evolved into modern English.he term English tends to be used (more-or-less) for the period after the Norman conquest (1066), when England became a single political unit. The English were a mixture of Anglo-Saxons, Celts, Danes, and Normans.