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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 .
What does has mean in Spanish? Has is the second person present singular (informal) form of the verb haber, which is the helper verb meaning to have. Â¿Has bebido la leche?