摘要: 情态动词“have to 与其他的情态动词如:“can , “may “must 和 “should 不同. (1)这4个情态动词没有人称的变化. 而have to有.它的第三人称单数为“has to 如:He should study hard . 他应该好好学习. He has to study hard . 他不得不好好学习. (2)这4个情态动词在一般疑问句中将它们提前大写.在否定句中直接在他们后边加not即可. 我们以can为例. Can he go with us ? 他能和我们一起去吗? He can’t go with us . 他不能和我们一起去. 而“have to 要加助动词do , does或did才可能完成其疑问.否定句. 同学们试着将下面三种话分别写成(1)一般疑问句.并做肯定回答.(2)否定句. A: They have to go to the party. Do they have to go to the party? Yes, they do. They don’t have to go to the party. B: He has to go to see the doctor. Answers: Does he have to go to see the doctor? Yes, he does . He doesn’t have to go to see the doctor. C. She had to have a piano lesson yesterday. Answers: Did she have to have a piano lesson yesterday? Yes, she did. She didn’t have to have a piano lesson yesterday. (用了助动词 “does 或 “did 表示疑问.否定时一定注意原来动词的第三人称单数或过去式要还原).

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