(3)need用作实义动词时,
3.dare
(1)My younger sister dare not go out alone.我妹妹不敢单独出去。
(2)If you dare cheat in your exam,I will give you some punishment.
如果你(们)敢在考试中作弊,我就惩罚你(们)。
(3)She dares to go there alone.她敢一个人去那里。
(4)He did not dare (to) leave his car there.他不敢把车停放在那里。
dare用法小结:
(1)dare"敢;敢于",dare用作情态动词时,具有四个特点:第一,
第二, ;第三, ;第四, 。
(2)dare用作实义动词时,
4.had better
(1)You'd better go to see a doctor.你最好去看看医生。
(2)You'd better not disturb him.你最好别去打扰他。
(3)How had we better go there?我们最好怎么去那儿呢?
(4)Hadn't we better take an umbrella?我们是不是带把雨伞比较好?
had better 用法小结:
(1)
(2)如何构成否定句和疑问句:
(3)在否定疑问句或反意疑问句中
(二)情态动词表示推测的句型归纳
must(一定,肯定),may/might(可能,也许),can/could(可能,通常用于否定句和疑问句中),should/ought to(应该)常可用来表示推测。
1.一般时推测:主语+情态动词(not)+动词原形。
(1)He must come from the USA.=It is certain that he comes from the USA.他肯定是美国人。
(2)He may/might/could come from the USA.= It is possible that he comes from the USA.
他可能(大概、也许)是美国人。
归纳:
2.进行时推测:主语+情态动词(not)+be doing sth.
(1)They must be organizing a great performance.
他们一定正在组织一次大型的演出活动。
(2)He should be working now.他现在应该在工作。
归纳:
3.完成时推测:主语+情态动词(not)+have done...
"情态动词+have done"可表示"推测""责备""怀疑"等多种意义。
(1)You shouldn't have told her the truth.你本不该告诉她真相的。
(2)The ground is wet.It must have rained last night.地面很湿,昨晚肯定下雨了。
(3)The ground is very dry,so it can't have rained last night.地面很干,昨晚不可能下过雨的。