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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 .
Madiini: I always get confused with the verb have when it is repeated, e.g.: I had had ... Please help me to understand when we can use have like this. Roger Woodham replies: have had / has had We typically use have as a main verb with an object to talk about common actions.