来源:中考网 作者:匿名 2009-11-05 14:39:24
情态动词是中考最重要的考点之一,考试重点我们会分期讲述。
情态动词有四类:
①只做情态动词:must,can(could),may(might),ought to
②可做情态动词又可做实义动词:need,dare
③可做情态动词又可做助动词:shall(should),will(would)
④具有情态动词特征:have(had) to,used to
情态动词在句中放在谓语动词之前, 谓语动词前若有助动词,则在助动词之前,疑问句中, 情态动词则在主语之前。
I can see you. Come here.
我能看见你,过来吧。
He must have been away.
他一定走了。
What can I do for you?
你要什么?
How dare you treat us like that!
你怎能那样对待我们!
Can 和Could的用法
1. 表示能力或客观可能性,还可以表示请求和允许。如:
Can you finish this work tonight?
Man cannot live without air.
— Can I go now? — Yes, you can.
注意:①could也可表示请求,语气委婉,主要用于疑问句,不可用于肯定句,答语应用can(即could不能用于现在时态的简略答语中)。如:
Could I come to see you tomorrow?
Yes, you can. (否定答语可用No, I'm afraid not.)
②can表示能力时,还可用be able to代替。如:
I'll not be able to come this afternoon.
2. 表示惊异、怀疑、不相信的态度。(主要用在否定句、疑问句或惊叹句中)
Can this be true?
How can you be so careless!
This cannot be done by him.
3. “can(could) + have + 过去分词”的疑问或否定形式表示对过去发生的行为怀疑或不肯定。如:
He cannot have been to that town.
Can he have got the book?
4. 用在疑问句及否定句中,表示惊讶,不相信等.
5. cannot```too\enough表示"无论怎样``````也不过分","越``````越好"
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