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The way present perfect is formed is -- have/has + past participle.

So the verb do would not be used in present perfect, but the past participle done is used.

I have done my home work. = a positive sentence.

I have not done my homework = a negative sentence.

She has not done her homework. = negative sentence.

The 'not' comes between the auxiliary verb have/has and the past participle.

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12y ago

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