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(完整版)can 的用法及练习
情态动词。can 的用法:
一、简介
1、结构:can + 动词原形,没有人称和数的变化。
2、否定形式:cannot/can’ t, cannot比缩略形式can' t要正式。口语中一般用缩略形式.
例如:I can swim.
Daming can ride a bike. He can’t drive a car。
二、用法
1、 表示能力(体力、知识、技能等),此时可用be able to代替。
例如:Mary can speak three languages. 玛丽会说三种语言。 = Mary is able to speak three languages。
注意:(1)can只有一般现在时和一般过去式;而be able to则有更多的时态。 例如:I'll not be able to come this afternoon。 今天下午我将会来。
(2)当表示“经过努力才得以做成功某事”时应用be able to,不能用can。
例如:He was able to go to the party yesterday evening in spite of the heavy rain。 尽管很大雨,他昨天能来参加聚会。
2、表示请求和允许。
例如:--—Can I go now?
—-— Yes, you can。 / No, you cannot/can’t.
此时可与may互换。在疑问句中还可用could, might(不可用于肯定句、否定句或答语)代替,不是过去式,只是语气更委婉。
例如:——- Could I come to see you tomorrow?
-—- Yes, you can. ( No, I'm afraid not. )
3、表示可能性猜测.
例如:The man over there can´t be my uncle. My uncle has gone to Beijing。 那个人不可能是我的叔叔。我的叔叔去北京了。
三、练习题
( )1.---Susan’s parents have bought a large house with a swimming pool.
---It ______ be very expensive。
A.must B.can C.mustn’t D、can't
(完整版)can 的用法及练习
( )2.The notebook______ belong to Sarah.Her name is on the cover.
A.might B.can’t C.must D.mustn't
( )3。——— May I put my bike here?
—-— No,you______.You should put it over there.
A.couldn't B.needn’t C.mustn't D.won’t
( )4.Boys,you______ be sitting in this room.It is for your teachers only.
A.shouldn't B.don’t have to C.won’t D.needn’t
( )5.—-—Whose pizza is this?
—-—I think it______ be mine.I’m the only one who ordered a pizza.
A.must B.could C.might D.can’t
( ) 6。 My brother can't sing but he ______ play the piano.
A。 can't B。 doesn’t C. can D。 don't
( )7。 You look tired。 You ______ to have a good rest。
A。 must B. may C. should D。 need
( ) 8.—-— Why do you think the man is running ?
---He ______ be ______ for exercise because he is wearing a suit 。
A. must , running B。 can’t ; run C。 can't ; running D. could ; running
( )9. --—Mum , I’ve been studying English since 8 o’clock。 ______ I go out and play with Tom for a while?
--—No, I’m afraid not. Besides, it’s raining outside now.
A. Can’t B。 Wouldn’t C。 May not D。 Won’t
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