Hi, We use the third form of verb with has/have like: "He has done that" then why we use first form of verb in this sentence : "he has not come yet"? You are dealing with irregular verbs. 'Done' and 'come' are both past participles.
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Anonymousthen why we use first form of verb in this sentence : "he has not come yet"?There's no rule that says the third form can't be the same as the first form.