I was writing an essay for my school project, and I stumbled upon this type of grammatical situation and thought if anyone knew the answer to it? I've searched all over the internet but nothing satisfied my needs. Any help? Thanks!
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The first one is present perfect, and the second one is past perfect.
He has already had breakfast, so he isn't hungry. Here, he isn't hungry now because he has recently eaten. "Has had" refers to a time before now, which is related to now.
He had already had breakfast, so he wasn't hungry at 8:00. "Had had" refers to a time in the past before another time in the past. He wasn't hungry at 8:00 yesterday morning because he had already eaten before then.