来源:学大教育 时间:2016-02-19
七下英语情态动词can复习练习(含解析外研版)
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.---can i go fishing with you,dad?
---no,you _____.you ______stay at home and do your homeworkfirst.
a.won't;may b.can't must c.shouldn't;ought d.needn't; should
( )2.---do you know whose dictionary it is?
---it ______ li mei's. his name is on it.
a.can't b.must't c.shouldn't d.needn't
( )3.---i can't stop smoking ,doctor.
---for your health,i'm afraid you ______.
a.can b.can't c.must d.mustn't
( )4.---is mr.brown driving here?
---i'm not sure. he ______come by train.
a.may b.shall c.need d.must
keys:bbca
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