情态动词can

2023-03-13 06:08:32   文档大全网     [ 字体: ] [ 阅读: ]

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情态,动词
情态动词can

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(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

KEYSBBCA




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