最新can-的用法及练习.doc

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1、Four short words sum up what has lifted most successful individuals above the crowd: a little bit more.-author-datecan-的用法及练习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 cant drive a car.二、用法1、 表示能力（

2、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：Ill 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 i

3、n 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/cant. 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, Im afraid not. )3、表示可能性猜测。例如：The man over there cant be my uncle.

4、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-Susans parents have bought a large house with a swimming pool. -It _ be very expensive. Amust Bcan Cmustnt D、cant( )2The notebook_ belong to SarahHer name is on the cover Amight Bcant Cmust Dmustnt( )3.- May I put my bike here? - No，you_Yo

5、u should put it over there Acouldnt Bneednt Cmustnt Dwont( )4Boys，you_ be sitting in this roomIt is for your teachers only Ashouldnt Bdont have to Cwont Dneednt( )5-Whose pizza is this? -I think it_ be mineIm the only one who ordered a pizza Amust Bcould Cmight Dcant( ) 6. My brother cant sing but h

6、e _ play the piano. A. cant B. doesnt C. can D. dont( )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. cant ; run C. cant ; running D. could ; running ( )9. -Mum , Ive been studying English since 8 oclock. _ I go out and play with Tom for a while? -No, Im afraid not. Besides, its raining outside now. A. Cant B. Wouldnt C. May not D. Wont-