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.
Is he have a ball?Yes,he isNo ,he isn't
He does not have a ball.Does he have a ball?yes ,he does.no, he does not