高中情态动词用法详解
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情态动词
一、情态动词的特点:
1.没有人称和数的变化。
2. 有些情态动词有过去式的变化:
e.g. will →would , can →could , may→might , dare →dared
二、情态动词的否定式:
情态动词+ not +动词原形
can not: can't , must not: mustn't , need not : needn't
三、情态动词的用法及相互区别, 是考试的内容之一。
1. can , be able to be able to 表示经过努力后, 能够做到; be able to 有多种形式的变化。can
1). 表示体力或脑力方面的能力;
2). 表示允许、可能性。
could 是can的过去式, 表示过去有能力及过去存在的可能性; 用于疑问句表示委婉地提出问题。
1) The fire spread through the hotel very quickly but everyone ____ get out.
A. had to
B. would
C. could
D. was able to
2) -Will you stay for lunch?
-Sorry, __. My brother is coming to see me.
A. I mustn't
B. I can't
C. I needn't
D. I won't
2.may 表示询问或说明一件事可不可做; 表示某事有可能发生。might是may的过去式; 用在疑问中比may委婉、客气。
1) -May I take this book out of the reading-room?
-No, you mustn't. ( Yes, you may.)
2) -Might I make a suggestion? -Yes, you may.
3. must
1). 表示必须要做的事: 必须
2) 表示很有把握的推断: 一定, 准是。have (has)to : have (has)got to 必须, 不得不。
过去式: had to
3) -Must I get to the station before three o'clock?
-Yes, you must. ( No, you needn't. )
4) I'm afraid you will have to wait a while.
5) She must be in the classroom now.
6) Mary ____ be in Paris, I saw her in town only a few minutes ago.
A. mustn't
B. shouldn't
C. can't
D. may not
4. shall
1) 在疑问句中, 用于第一、三人称表示说话人征求对方的意见或向对方请求。
2) 用于二、三人称,表示说话人给对方的命令、警告、允诺等概念。
1) - Shall I place an order with you now? -No, you needn’t.
-Shall he turn down the radio a bit? -
Yes, please.(No, please don't.)
2) You shall have the English book as soon as I finish it.
3) Everything that he owns shall be taken away from him.
4) Your brother seldom comes to see you, ____?
A. does he
B. doesn't he
C. will he
D. isn't he
5) It's a fine day. Let's go fishing, ____?
A. won't we
B. will we
C. don't we
D. shall we
5. should 应该; 应当
1) You should listen to the doctor's advice.
2) You should study the article carefully.
6. will, would
1) 在疑问句中用于第二人称,表示说话人向对方提出请求或询问。用would语气更加婉转。
2) will 表示现在的习惯性动作或状态; would 表示过去的习惯性动作或状态。
3) will 用于各种人称, 表示意志、意愿、决心、允诺; would 表示过去时间的意志、意愿、......。
(1) Don't smoke in the meeting room, ___ you?
A. do you
B. will you
C. can you
D. could you
-Will you come with me? -Yes, I will.(I am sorry , I can't.)
(2) -Would you tell us something about yourself? -Yes, I will.
(3) - It's my birthday tomorrow. Don't forget to come to my party.
- _____ .
A. I don't
B. I won't
C. I can't
D. I haven't