七年级英语下册 module 2 what can you do语法要点语法要点 （新版）外研版

我带领班子成员及全体职工，积极参加县委、政府和农牧局组织的政治理论学习，同时认真学习业务知识，全面提高了自身素质，增强职工工作积极性，杜绝了纪律松散Module 2 语法要点情态动词can1.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.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：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 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/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. 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。4. 如果要询问某人能不能做某事则需把an 提至句首，例如：-Can you speak Chinese? 你会说汉语吗？-Yes, I can. / No, I cant. 是的，我会。/ 不， 我不会。-Can she swim? 她会游泳吗？-Yes, She can. / No, she cant. 是的，她会。/ 不，她不会。练习题( )1.-Can I go fishing with you,Dad?-No,you _.You _stay at home and do your homework first.A.wont; may B.cant must C.shouldnt; ought D.neednt; should( )2.-Do you know whose dictionary it is?-It _ Li Meis. His name is on it.A.cant B.mustnt C.shouldnt D.neednt( )3.-I cant stop smoking ,doctor.-For your health, Im afraid you _.A.can B.cant C.must D.mustnt ( )4.-Is Mr. Brown driving here?-Im not sure. He _come by train.A.may B.shall C.need D.must参考答案1.B 2.B 3.C 4.A