He has a ball.(改为否定句和一般疑问句 并作肯定，和否定回答。
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常把has作为实义动词看待，其中has体现三单，故借助助动词does。
否定句：He doesn't have a ball.
一般疑问句：Does he have a ball?
肯定回答：Yes, he does.
否定回答：No, he doesn't.
否定句：He doesn't have a ball.
一般疑问句：Does he have a ball?
肯定回答：Yes, he does.
否定回答：No, he doesn't.
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He does not have a ball.
Does he have a ball?
yes ,he does.
no, he does not
Does he have a ball?
yes ,he does.
no, he does not
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