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How can I use "have had", "has had" and "had had"?
I'm wondering how to use "have had", "has had" and "had had". Can you explain it to me?
Yes, of course. "Have had" is the present perfect form of the verb, used to describe an action that happened in the past and is still happening or has just ended. "Has had" is the same form but used when the subject is singular, such as "He has had a difficult day." "Had had" is the past perfect form, used to describe an action that happened before another past action, such as "She had had breakfast before leaving for work."