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第七讲：动词要点.ppt 18页
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* 第七讲 动
词 (1) can和could
Ⅰ 情态动词的基本用法 eg. Can I go now?
You can sit here.
表示能力。 eg. Her mother can speak French.
When he was young, he could sing very well. 表示客观可能性。 eg. Anyone can make mistakes.
Man can't live without air. 表示许可。 表示请求。
could比can语气更委婉。两者没有时间上的差别，主要用于疑问句，不用于肯定句，因此回答时要改用can。 eg. —Could I come here again tomorrow?
—Yes, you can. 表示惊讶、怀疑、不相信（主要用于否定、疑问或感叹句） eg. This can't be done by him.
Can this be true? (2) may和might
eg. May you enjoy yourself!
May you succeed!
表示允许，请求。 eg. You may go now.
Might I go with you? 表示可能性（主要用于陈述句、肯定句或否定句中，疑问
句用can代替。) eg. He may be very busy these days.
The story may not be true. 表示祝愿（不用might）。 —May I watch TV now? —Yes, you may./No, you mustn't. Ⅰ 情态动词的基本用法 (3) must, have to, ought to
eg. He will have to be there before ten.
As he had broken his leg, he had to lie in bed.
must表示“必须，应该”，强调主观看法，只有现在时形式。 eg. You must attend the meeting on time.
You mustn’t corss the road when the light is red.
must还可以表示必然的结果,“一定会”。 eg. All men must die.
If you don‘t hurry, you must miss the train. have to表示“不得不”，能用于更多的时态。 —Must I do it at once?
—Yes, you must./No, you needn‘t. eg. You ought to take care of yourself.
Such things ought not to be allowed to happen again. ought to表示义务和责任（比should语气更强）。 Ⅰ 情态动词的基本用法 (4) need和dare
eg. She dare not do it.
Dare you go home alone at eleven in the evening？
He asked me if I dare go there alone.
need表示“需要，必要”，只用于否定句和疑问句中，在肯定句中，常用must和have to代替。 eg. You needn't call him. dare表示“敢”，通常用于否定、疑问和条件状语从句中。 —Need I come? —Yes, you must./No, you needn‘t. dare 和need 不仅是情态动词，也可做实意动词用。
take an umbrella with him.
go out myself.
need dare to
dare doesn’t need to
needn’t don’t dare to
dare not Ⅰ 情态动词的基本用法 (
) 1. —Must we hand in the papers now?
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