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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 .
you can use muy and frio together and it means very cold and mucho means much/alot and much cold doesnt sound right so yes you can use then them together hope i helped. Source(s): spanish speaker. italiana mocha Â· 9 years ago. Thumbs up.