一、考查情态动词表示"推测"的用法

　　[考点快忆]表示肯定推测的情态动词有:must"一定;准是",may"也许;可能",might"或许";表示否定推测的情态动词有:can't"不可能",couldn't"不会",may not"也许不",might not"或许不";can表示推测时不用于肯定句,may表示推测时不用于疑问句。

　　[考例分析]

　　Susan's parents have bought a large house with a swimming pool. It________be very expensive. (2003上海市)

　　A. must B. can C. mustn't D. can't

　　析:mustn't意为"不许;不准",不表示推测;can't意为"不可能",选项C?D均不符合题意,故排除。另外,can在肯定句中不表示推测,而表示"能力"或"许可",也排除?题意为"苏姗的父母亲买了一栋带游泳池的房子",因而可推测出"它肯定很贵"。故选A。

　　二、考查情态动词引起的一般疑问句的答语

　　[考点快忆]must引起的问句,肯定答语用must,否定答语用needn't或don't have to;need引起的问句,肯定答语用must,否定答语用needn't。

　　[考例分析]

　　-May I try this one on, please?

　　-________This way, please. (2003湖北省黄冈市)

　　　A. I'm sure you can. B. No hurry. C. Certainly, sir. D. That's all right.

　　析:选C?对于may提出的请求"许可"时,肯定答语若用"Yes, you may."语气太生硬,而要用"Yes, of course/certainly."等;表示否定用"No, you mustn't."或"No, you can't."。

　　三、考查情态动词的意义

　　[考点快忆]must"必须";have to"不得不";need"必须;需要";can(could)"能;可能";may(might)"可以;可能";shall, will(would) "将;会;愿意;要";should"应当"。

　　[考例分析]

　　1. -SARS is such a terrible disease.

　　　 -Yes, it is. We________be more careful. (2003浙江省舟山市)

　　A. can B. may C. must D. need

　　析:"SARS可怕","必须小心"。故选C。

　　2. You________go and ask Meimei. She________know the answer. (2003天津市)

　　A. must; can B.must; may C.need; can D.can;may

　　析:题意为"你可以去问梅梅,她可能知道答案。"故选D。

　　四、其它

　　[考点快忆]"had better(not) +动词原形"表示建议;have to/has to/had to的否定/疑问形式要借助于助动词do/does/did。

　　[考例分析]

　　1.Look! How heavy the rain is! You'd better________. (2003河北省)

　　A. don't go now B. stay here when it stops

　　C. not leave until it stops D. not to leave at once

　　析:had better后接动词原形,其否定形式为"had better not+动词原形",排除A、D,而据题意应选C。

　　2. -Please don't make any noise in the reading room.

　　　 -________.(2003安徽省)

　　A. Sorry, I won't B. Sorry, I can't

　　C. Yes, I won't D.OK, I didn't

　　析:选A。"Sorry, I won't."意为"对不起,我将不会那样做的。"

　　(文/梁淑媛；英语辅导报初三版03--04学年度第25期；版权归英语辅导报社所有，独家网络合作伙伴新浪教育，未经许可，不得以任何形式进行转载。)