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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 .
should have: You should use should have in a sentence as past tense like You should have done your chores.. I agree with that as: This is used when you are talking about an e â¦ vent that took place over time. should had: You might be thinking of I should have had as in I should have had more sympathy for them. sentence can be as long as one desires, so long as it is one (1) thought or idea.