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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 .
Usage within the education system. 'Sir', along with miss for females, is commonly used in the British school system to address teachers; and or members of faculty as well as staff. Usage of these terms is considered a mark of respect, and can be dated back to the 16th century.