(完整版)can 的用法及练习

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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:(1can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



Amust Bcan C.mustn’t D、can't




(完整版)can 的用法及练习

( 2The notebook______ belong to SarahHer name is on the cover



Amight B.can’t C.must Dmustn't



)3。——— May I put my bike here



- Noyou______You should put it over there



Acouldn't B.needn’t C.mustn't D.won’t



)4Boys,you______ be sitting in this roomIt is for your teachers only



Ashouldn'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



Amust Bcould Cmight 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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