情态动词推测用法精讲精练[2].ppt

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1、 情态动词推测用法情态动词推测用法一、用法一、用法从高考及平时各类考试情态动词的推测用法来看，主要有must,should,can(could),may(might)几个词，现对它们的用法按可能性从大到小排列列表如下：一般式：must/should/can/could/may/might do sth.进行式：must/should/can/could/may/might be doing sth.完成式：must/should/can/could/may/might have done sth.注：对现在和过去的状态进行推测则分别将注：对现在和过去的状态进行推测则分别将do sth.和和ha

2、ve done sth.改为改为“be+表语表语”和和“have been+表语表语”形式。形式。二、关键点拨二、关键点拨1表推测时，表推测时，might不是不是may的过去式，的过去式，could不是不是can的的过去时，而是表示过去时，而是表示might/could的可能性比的可能性比may/can还小，还小，所以，上述情态动词的过去式并不表示对过去的情况进行所以，上述情态动词的过去式并不表示对过去的情况进行推测。推测。2should表示根据事物内在发展的规律、事情发展的必然表示根据事物内在发展的规律、事情发展的必然性得出的结论，表示性得出的结论，表示“某人（某事）按道理应该（理应）某人（

3、某事）按道理应该（理应）”。3can/could常用于否定句和疑问句中表示推测，但在表常用于否定句和疑问句中表示推测，但在表示示“有时候可能有时候可能”或或“从理论上讲从理论上讲”时，也可用于肯定句时，也可用于肯定句中。中。4may/might not用于否定句中表用于否定句中表“可能不可能不”，而不是，而不是“不可能不可能”。三、实例助记三、实例助记1现在（正在进行）的动作或状态现在（正在进行）的动作或状态There shouldnt be any difficulty about passing the road test since you have practiced a lot in

4、 the driving school.（2005上海）因为你在驾校已经进行了大量的实上海）因为你在驾校已经进行了大量的实习，按道理你通过路考是没有任何问题的。习，按道理你通过路考是没有任何问题的。Helen may go on the trip with us,but she isnt quite sure yet.（2005安徽）海伦可能会和我们一起去旅行，但安徽）海伦可能会和我们一起去旅行，但她现在还不确定。她现在还不确定。The World Wide Web is sometimes jokingly called the World Wide Wait because it can

5、be very slow.（2005浙江）由于万维网有时可能速度很慢，所以人们有时戏称浙江）由于万维网有时可能速度很慢，所以人们有时戏称之为之为World Wide Wait。Someone is knocking at the door.Who can it be?有人有人在敲门。可能是谁呢？在敲门。可能是谁呢？Hurry up!They must be waiting for us at the school gate.快点！他们一定在校门口等我们呢。快点！他们一定在校门口等我们呢。2过去（正在进行）的动作或状态过去（正在进行）的动作或状态Tom is never late for wor

6、k.Why is he absent today?汤姆从不上班不迟到。为何他今天没来汤姆从不上班不迟到。为何他今天没来？Something must have happened to him.（2005江西）江西）他一定发生了什么事。他一定发生了什么事。I was on the highway when this car went past followed by a police car.They must have been doing at least 150 kilometers an hour.（2005重庆）我当时正在公路上行驶，重庆）我当时正在公路上行驶，突然这辆小汽车超过，后面

7、跟着一辆警车。他们当时一定是突然这辆小汽车超过，后面跟着一辆警车。他们当时一定是在以至少每小时在以至少每小时150公里的时速行驶。公里的时速行驶。Do you know where David is?I couldnt find him anywhere.你知道大卫在哪里吗你知道大卫在哪里吗？我到处找不到他。？我到处找不到他。Well.He cant have gone farhis coats still here.（2005湖北湖北）噢。他不可能走远的）噢。他不可能走远的他的外套还在他的外套还在这儿。这儿。I cant find my dictionary.Li Hong may have

8、 taken it away.我找不着字典了。李红可能拿走了。我找不着字典了。李红可能拿走了。1.He _ have completed his work;otherwise,he wouldnt be enjoying himself by the seaside.(2005北京卷)A.shouldB.must C.wouldntD.cant2.This cake is very sweet.You _ a lot of sugar in it.（2005辽宁卷）A.should putB.could have putC.might putD.must have put3.Is John c

9、oming by train?He should,but he _ not.He likes driving his car.(NMET2002)A.mustB.canC.needD.may4.My English-Chinese dictionary has disappeared.Who _ have taken it?（2003上海春季）A.shouldB.mustC.couldD.would5.When can I come for the photos?I need them tomorrow afternoon.They _ be ready by 12:00.（NMET1998）

10、A.canB.shouldC.mightD.need6.Isnt that Anns husband over there?No,it _ be himIm sure he doesnt wear glasses.（NMET2004）A.cantB.must notC.wontD.may not7.Excuse me.Is this the right way to the Summer Palace?Sorry,I am not sure.But it _ be.（2004湖北湖北）A.mightB.willC.mustD.can8.My sister met him at the Gran

11、d Theatre yesterday afternoon,so he _ your lecture.（2000上海上海）A.couldnt have attendedB.neednt have attended C.mustnt have attendedD.shouldnt have attended9.Sorry,Im late.I _ have turned off the alarm clock and gone back to sleep again.（2000北京春季北京春季）A.should B.canC.mightD.will10.Its nearly seven oclock.Jack _ be here at any moment.（NMET 1995）A.must B.needC.shouldD.can