高中英语情态动词讲解

高中英语情态动词讲解

Grammar: Modal verbs

高中英语情态动词讲解

How many modal verbs

do you know?

高中英语情态动词讲解

can could may might shall should must will would ought to

表示推测

modal verbs不表示推测

have to dare (daren’t) need (needn’t) used to

高中英语情态动词讲解

表示推测1.一定，肯定 must 一定不，不可能 can’t, couldn’t 2.可能 肯定句 may ,might ,could 否定句 may \might not 疑问句 can ,could 都可以 + do sth.表示现在 be doing 表示正在发生的动作 have done表示过去发生的动作

高中英语情态动词讲解

1.must表示推测时，可以推测现在/正在发生 的动作/过去发生的动作。 他一定有一辆车. He must have a car now. 他一定在教室里做练习。

He must be doing his exercises in the classroo 他一定已完成了工作

He must have finished the work.

高中英语情态动词讲解

一定不，不可能 can’t couldn’t He can`t be at home. He couldn't have said such a thing .他们一定不在图书馆读书。 They can`t be reading in the library 约翰是很聪明的，他应该不会叫他儿子那 样做。 John is very clever . He cannot have told his son to do that .

高中英语情态动词讲解

2.可能

肯定句 could , may ,might 否定句may \might not(可能不) 疑问句 can ,could 他可能正在睡觉。

These students may / might have seen the film before. 否定句 The boy may / might not be watching TV at home. (现在) 这个男孩可能没在家看电视

He may / might be sleeping now

高中英语情态动词讲解

疑问句 How could he have forgotten such an important thing?这么重要的事他怎么能忘 了呢？ It`s so late. Where can she have gone? 天晚了，她可能去哪儿了呢？ Can you have left the watch at home?你 会不会把表丢在家里呢？

高中英语情态动词讲解

一.Choose the best answers to complete the following sentences: 1. I thought you______ like something to read. So I have brought you some books. A. ought B. might C. could D. must 2. –That man must be Sarah`s husband. --No, he_____ be her husband. She is still single. A. can`t B. mustn`t C. may not D. ought to 3. Peter _____come with us tonight, but he isn`t very sure. A. must B. may C. can D. will

高中英语情态动词讲解

4.–What____ it be? --It______ be a mail box, for it is moving.It______ be a car. A. B. can; can; must can; can`t; must C. can; mustn`t; must D. must; mustn`t; can

5. –Look, someone is coming. Guess__________ . --Jack. He`s always on time. A. who can it be B. who he may who it can be C. who he can be D.

高中英语情态动词讲解

6. –I saw Mary in the library yesterday. --You_____ her. She is still abroad. A. mustn`t see B. can`t have seen C. mustn`t have seen D. couldn`t see 7. David, you _____play with the valuable bottle, you_______ break it. A. won`t; can`t B. mustn`t; may C. shouldn`t; must D. can`t; shouldn`t

高中英语情态动词讲解

表示能力一.表示能力can, could, be able to can表示智力，体力方面的能力只能用 现在 或过去时。 be able to通过努力克服困难作成事情, 能用 于各种时态。 *was / were able to : 设法做成某事 相当于 managed to do sth. succeeded in

doing sth.。

高中英语情态动词讲解

can与be able to 用法区别常与句子时态有关 1.现在时比较 1) 表示”能力”时,be able to 不用于第二人 称, You are able to do the work, I think. (X) 改用can can与感官动词feel, hear, see, smell, taste 连用时, can显得可有可无,因而失去了情态动 词的意义,这种情况下can不能用be able to

代替

e.g., We can see beautiful flowers and green trees here and there. Anyone can see it is of no use.

高中英语情态动词讲解

) can与某些表示意念的动词如：understand, remember, forget, hope, imagine, believe, suppose等连用时，同样没有情态动词的意义，也 不可用be able to取代。 e.g. I can’t believe there are so many tall buildings now in my home town3

2.过去时比较

was/were able to 意含”经过努力” “凭借才能” 获得的”能力”常与”manage to ”相通 They were short of modern machines, but they were able to complete the project in time.

高中英语情态动词讲解

二.表示允许

can, could ,may, might

might,could 表达更客气、委婉、礼貌的请求语气。 Excuse me, could you tell me the way to the bus station? Could you help me? You can go now if you like. May I smoke in the room?

高中英语情态动词讲解

三.表示必须ought to/should have to must *have to 能用于各种时态,且有人称和数的变 化. ought to 的否定式为ought not to或者 oughtn’t to