【#第一文档网# 导语】以下是®第一文档网的小编为您整理的《can-的用法及练习》，欢迎阅读！
精品文档 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. 't drive a car. Daming can ride a bike. He can 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. （不可用于肯定句、否定句或答语） 此时可与may互换。在疑问句中还可用 could, might 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 3、表示可能性猜测。 'm afraid not. ） 例如： The man over there can 'tbe my un cle. My uncle has gone to Beiji ng. 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. 精品文档 1欢迎下载 。 ---It ______ be very expensive. A ．must B ．can C ． mustn't D 、 can't ( )2 ． The notebook _______ belong to Sarah 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 ． Her name is on the cover ． ． ． 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 A. can 't sing but he _____ play the piano. 't C. can D. don 't B. doesn '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 ( )9. ---Mum , I 't; run C. can 't; running D. could ; running 'clock. ______ I go out and 've been studying English since 8 o play with Tom for a while? ---No, I A. Can 't 'm afraid not. Besides, it B. Wouldn 's raining outside now. D. Won 't C. May not 't 2欢迎下载 。 本文来源：https://www.dywdw.cn/114c7a235b1b6bd97f192279168884868762b880.html
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2023-03-13
