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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 .
So use was when you have a singular subject eg He was, I was, the doctor was, Were = plural. â¦ So use were when you have plural subjects eg We were, they were, the doctors were. I was busy last week. The doctors were busy last week.