Anonymous Is it acceptable to use "had had" in a sentence ? Yes. It's the past perfect tense of "to have".
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Anonymous Is it acceptable to use "had had" in a sentence?Yes. It's the past perfect tense of "to have". It just turns out that by coincidence the auxiliary verb is had, and the past participle of the main verb is also had. The rule for forming that tense is the same as for any other verb: