2021年小升初英语语法专项培优突破 第12章：助动词和情态动词（5）have to

1、5.have to5.have to have(has)to 与 must 一样， 表示“必须”的意思， 两者的区别参见第 154 页 比 较：must 与 have to。 1) have to 的用法的用法 I have to get up early tomorrow morning. 我明天早晨必须(不得不)早起。 1.have(has)to +动词原形动词原形 have(has)to 后面要用动词原形。当主语为第三人称单数时用 has to，当句子是 过去时用 had to。 We have to leave now. 我们不得不现在就离开。 He has to work on Su

2、nday. 他不得不在周日工作。 I had to do my homework last Sunday. 上周日，我不得不做作业。 2) have to 的否定句的否定句 句型：主语+dont(doesnt)have to+动词原形. You dont have to walk so fast. 你不必走那么快。 He will not have to buy a new coat next year. 明年，他没必要买新外衣了。 3) have to 的疑问句的疑问句 句型：Do(Does)+主语+have to +动词原形？ Do you have to study maths now？

3、 你现在必须学数字吗？ Yes，I do.是的，必须 No，I dont(have to).不，不必 Did he have to ask the question？ 他非要问那个问题吗？ Yes，he did.是的。 No，he didnt(have to).不。 have to 练习题练习题 词形转换 1You must wash the dishes. =You_ _ wash the dishes. 2She can cook well. =She _ _ _ cook well. 3Wash your face at once. =You _wash your face at once. 4They couldnt find any secrets(秘密). =They _ not _ to find any secrets. 5You should be here on time. =You _ _ be here on time. 【答案】 1have to 2is able to 3must 4was, able 5ought to