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1、省高中英语 语法专题复习8情态动词一、考点聚焦1、 情态动词的根本用法(1)can、be able to 和couldcan和be able to都表示能力，意思上没多大区别。但can只有现在和过去时，而be able to那么有更多的形式。但当成功地完成某一具体动作时，通常不用could而用was/were able to来表示。这时was/were able to 相当于managed to，表示经过一番努力，终于能够完成某事。如：Can you use chopsticks?The wounded man still was able to get to the village and
2、was saved in the end.can和couldcan和could都可以表示能力、技能、许可、建议或请求和可能性。但比拟委婉客气地提出问题或陈述看法，一般用could，答复时那么用can。如：Could you help me carry the bag?Can I help you?(2)may/mightmay/might表示可能，但may比might可能性大。如：-Why isnt he in class? He may be sick.(生病的可能性较大) He might be sick.(生病的可能性较小)may/might表示“允许，may用于现在时或将来时，migh
3、t常用在间接引语中表过去时，但might也可用于现在时间，表示比拟委婉的语气，答复用may。如：He says we may leave.He said we might leave.may / might 表示建议或请求，但might比may更客气，意思更肯定而无过去时态的含义。 Yes, you can / may.May / Might I use your bike? No, you mustnt3mustmust表示必须，应该，没有时态变化。如：You must do everything as I do.must表示肯定的推测。如：The light is still on, so
4、 he must be at home.mustnt 表示禁止做某事。如：You mustnt smoke in the office.4have tohave to 表示“必须、不得不，是由于某种外界客观原因而“必须，“不得不做某事，也可表示经常的或习惯性的事“必须做。have to的否认形式表示不必。have to可用于多种时态中。如：You will have to clean your own boots when you join the army.I have to be at my office every evening.5should / ought toshould和oug
5、ht to表示应当、应该，前者比后者语气轻。如：You should / ought to work hard.should / ought to work hard.Since she is not here, whe should / ought to be in the classroom.should / ought to的否认形式表示禁止之意。如：Children shouldnt smoke.should可表示陈述意见，推出建议或请求；而ought to可以表示劝告之意。如：You ought to respect your parents.He suggested that th
6、ey should leave at once.6will / wouldwill 用于各种人称表示“意志、“意愿或“决心等，否认式wont + 动词。如：I will tell you all about it.Tom wont do such a thing.will用于疑问句中，常用在第二称时表示说话人向对方提出“请求或“询问如：Will you please tell her the news when you see her?will 表示习惯性的动作，有“总是、“惯于的含义。如：Fish will die out of water.would 表示客气的请求、建议或意愿。如：Wou
7、ld you please be quiet?Would you like coffee?would 表示过去反复发生的动作。如：When I passed my school I would see my teachers who taught me 5 years ago.7needneed 作“必要讲，既可作情态动词，也可作实义动词。作实义动词时后面的动词不定式要带to，其变化与一般动词相同。如：I need to think it over.Need you go now? Yes, I must./No, I neednt 8dare在疑问句中，shall用于征求对方的意见或请求指示
8、，常用于第一、第三人称。如：Where shall he wait for us?Shall we go out for a walk?2、情态动词表示推测或判断的用法下表即是表示推测的情态动词使用的场合：情态动词对现在和未来的推测对过去的推测使 用 场 合mustmust + 动词原形must have done肯定句may / mightmay / might + 动词原形May / might have done肯定句、否认句can /couldcan / could doCan / could have done否认句、疑问名could可用于肯定句should用来表示一种估计的情况“按
9、理会/估计会should do/beshould have done肯定句、否认句、疑问句 例如：It must have rained last night.She may not be at home. = It is possible that she is not at home.She cant be at home. = It is impossible that she is at home.They should be there right now.3、情态动词在虚拟语气中的用法情态动词用于虚拟语气中表示责备的感情色彩，用法如下：1should have done表示“本来应
10、该做某事而实际上未做，而shouldnt have done那么表示“本不应该做某事而实际上做了。如：You should have told me about it earlier.You shouldnt have said such words to your parents.2ought to have done也表示“本应该而ought not to have done那么意为“本不应该。如：You ought to have told me about it earlier.You ought not to have said such words to your parents.
11、3neednt have done表示“本无必要做某事而实际上做了。如：You neednt have walked so quickly since time was enough.4could have done表示“本来有可能而事实上未做到。如：I could have come on time, but my car broke on the way.二、精典名题导解3. Will you stay for lunch?Sorry, _. My brother is coming to see me.(NMET 99)A.I mustnt B.I cant C.I neednt D.I
12、 wont解析：答案为B。此题考查表示请求的英语口语，用will来向第二人称提问的疑问结构，是表示一种请求和意愿，是用疑问的形式来表达较为婉转的祈使语气，意思是“请你，好吗，对于这种问句的肯定答复是：Suree! Gertainly! Yes, of course. Id be glad to 等；否认答复通常是：Im sorry, I cant. No, Im afraid I cant. Im sorry, but Id like to, but 等。注意情态动词表客气的用法及其在一般疑问句中的问与答。4.Isnt that Anns husband over there? No, it
13、be him Im sure he doesnt wear glasses.A. cant B. must not C. wont D. may not解析：答案为A。此题考查情态动词表推测。问：那边的难道不是Ann的丈夫吗？答：不是。不可能是他，我确信他不戴眼镜。5.You be tiredyouve only been working for an hour.A. must not B. wont C. cant D. may not解析：答案为C。此题考查情态动词。句中破折号后的内容对前一句进行解释说明：你只工作了一个小时，所以你不可能累的。表否认推测时用cant。A项表禁止不许，B项表未来，D项表不允许。均不可用，应选C。6.I often see lights in that empty house. Do you think I report it to the police？A. should B. whatever C. whichever D. whenever解析：答案为A。此题考情态动词。在空房子里看到灯光，是一件奇怪而令人生疑的事，故问：你是否认为我应当把这事儿报告给警察？应用A。