1、1专题 3 情态动词和虚拟语气框架结构图情态动词的核心考点1.can/could和 be able to的用法(1)can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则有更多的形式。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。Her mother can speak French.The wounded man was still able to get to the villa
2、ge and was saved by the villagers in the end.(2)can/could表示猜测“可能” ，一般用于疑问句和否定句。Can the news be true?It cant be true.Someone is knocking at the door.Who could it be?(3)can可以表示理论上的可能性，指常有的行为或情形，意为“有时会” 。Anybody can make mistakes.(4)表示请求、允许(表请求时，口语中常用 could代替 can使语气更委婉，回答时用 can)。Can I go now?2Could I c
3、ome to see you tomorrow?Yes，you can.(否定答语可用 No，Im afraid not.)(5)表示惊异、怀疑、不相信的态度(主要用于否定句、疑问句或感叹句中)。How can that be true？I cant believe my eyes and ears.How could you be so careless?(6)can的特殊用法。can but只好；cant but 不得不；cant.too 再也不为过，越越好I can but wait.I cant but wait.You cant be too patient to the custo
4、mers.2.may和 might的用法(1)表示允许、请求，might 比 may的语气更委婉一些。May I watch TV now?Yes，you may.(Yes，please.)No，you mustnt.(No，youd better not.)(2)表示可能性时，might 比 may的可能性小，may 表示的可能性比 can小(主要用于陈述句、肯定或否定句，疑问句用 can代替)。The story may not be true.(3)表示祝愿(不用 might)May you succeed!(4)may/might as well最好还是，不妨You might as
5、well do it now.(5)may/might well很可能He may well be late for class.3.must，have to 和 ought to的用法(1)must表示“必须，应该，一定要” 。强调主观看法，只有现在时形式，否定式是 must not(mustnt)。must 开头的问句，其否定回答要用 neednt或 dont have to来表达。We must do it now.Must I hand in the paper today?Yes，you need/must.No，you neednt/dont have to.表示必然的结果。3Al
6、l men must die.还可表示主语固执、偏要做他人不希望做的事。It cant help；he must do that.(2)have to着重客观需要，能用于更多时态(过去时或将来时)。He will have to be there before ten.(3)ought to表示义务和责任，意为“应该” ，比 should语气要强。You ought to take care of yourself.4.need和 dare的用法(1)need表示“需要，必要” ，只能用于否定句和疑问句。在肯定句中，常用 must和 have to代替。You dont need to do
7、it at once.Need I come?(2)dare表示“敢” ，通常用于否定句、疑问句和条件状语从句中。I darent ask her for a rise.Dare you go home alone at eleven in the evening?If you dare speak to me like that again，youll be sorry.(3)need和 dare的特殊用法need 表“需要”时，可用 want，require 代替。The desk needs repairing/to be repaired.The desk wants/requires
8、 repairing/to be repaired.dare 作实义动词时，在肯定句中要接 to，在疑问句和否定句中 to可省去。He dares to catch a snake.I do not dare (to) complain.Do you dare (to) swim in the river?5.will和 would的用法(1)will表示请求、建议，常用于第二人称。Will you please go with me?表示意愿、决定、允许。I will never do that again.表示习惯性动作或某种倾向，意为“总是，惯于” ，通常用于第三人称。Rosa will
9、 always be late for school.(2)would表示请求、建议，比 will委婉，指现在时间，多用于第二人称。4Would you like a cup of tea?表示过去习惯性动作或某种倾向。We would play badminton on Sundays.6.shall和 should的用法(1)shall用于第一、三人称，在问句中表示征求对方意见或请求。Shall I come in?When shall he be able to leave the hospital?用于第二、三人称的陈述句中，表示命令、允诺或威胁。You shall do as you
10、r father says.He shall have the book when I finish reading.He shall be punished.(2)should表示责任、义务，意为“应该” 。You should listen to your doctors advice.表示惊讶语气，意为“竟然” 。You should wear slippers in class.用于条件句，表示“假如，万一” ；省去 if，should 可提至句首。Should you be late，apologize to the teacher.7.情态动词表示推测或判断的用法情态动词 对现在和
11、未来的推测 对过去的推测 使用场合must mustdo must have done 肯定句may/mightmay/mightdo may/might have done肯定句、否定句can/couldcan/could docan/could have done否定句、疑问句(could 可用于肯定句)should should do should have done 肯定句、否定句、疑问句情态动词have done 的用法：(1)should have done表示“本来应该做某事而实际上未做” ，而 shouldnt have done则表示“本不应该做某事而实际上做了” 。You
12、should have told me about it earlier.You shouldnt have said such words to your parents.(2)ought to have done表示“本应该做某事而实际上未做” ，而 ought not to have done5则意为“本不应该做某事而实际上做了” 。You ought to have told me about it earlier.You ought not to have said such words to your parents.(3)neednt have done表示“本无必要做某事而实际
13、上做了” 。You neednt have walked so quickly since time was enough.(4)could have done表示“本来有可能做某事而事实上未做到” 。I could have come on time，but my car broke down on the way.(5)may/might have done表示 “过去可能发生过某事”或“本来应该/可以做某事(实际上没做)” 。You might have given him more help，but you were so busy.虚拟语气的核心考点1.虚拟语气用于条件状语从句(1)
14、表示与现在事实相反的假设，条件状语从句中的谓语动词用一般过去时(be 动词用 were)，而主句中的谓语动词用“would/should/could/might动词原形” 。If I were you，I would buy that house.If he had time，he should go with you.(2)表示与过去事实相反的假设，条件状语从句中的谓语动词用过去完成时，主句中的谓语动词则用“would/should/might/couldhave过去分词” 。If he had taken my advice，he would have succeeded in passi
15、ng the examination.(3)表示与将来事实相反的假设，条件状语从句中的谓语动词用一般过去时或“should/were to动词原形” ，而主句中的谓语动词则用“would/should/could/might动词原形” 。If it rained/should rain/were to rain tomorrow，the football match would be put off.(4)当条件状语从句表示的行为和主句表示的行为所发生的时间不一致时，动词的形式要根据它所表示的时间作相应调整。If they had worked hard，they would be very
16、tired now.(从句说的是过去，主句指的是现在)2.虚拟语气用于名词性从句(1)虚拟语气在宾语从句中的运用。“wish宾语从句”表示不能实现的愿望，译为“要是就好了” 。表示现在没有实现的愿望，从句中的谓语动词用一般过去时(be 动词用 were)；表示将来不能实现的愿望，从句中的谓语动词用“would/could动词原形” ；表示过去未能实现的愿望，从句中的谓语动词用“had过去分词” 。6I wish it were spring all the year round.I wish I had known the answer.I wish I could fly like a bi
17、rd.在表示“建议、要求、命令”等动词后的宾语从句中，谓语动词用“should动词原形” ，should可以省略。常见的这类动词有：suggest，advise，propose，demand，require，insist，request，command，order 等。She suggested we (should) leave here at once.The doctor ordered she (should) be operated on.(2)虚拟语气在同位语从句和表语从句中的运用。表示“建议、要求、命令”等的名词，如advice，idea，order，demand，plan，pr
18、oposal，suggestion，request 等，其后的表语从句和同位语从句中谓语动词用“should动词原形” ，should 可以省略。His suggestion that we (should) go to Shanghai is wonderful.My idea is that they (should) pay 100 dollars.(3)虚拟语气在主语从句中的运用。在主语从句中，谓语动词的虚拟语气用“(should)动词原形”的结构，表示惊奇、不相信或理应如此等。It is necessary that we (should) clean the room every
19、day.It was a pity/a shame that you (should) be so careless.It will be desired that she (should) finish her homework this afternoon.注意：这种从句表示的是事实。如果人对这种事实表现出惊奇的情感，就可用虚拟语气；反之，如果不表示惊奇等情感，that 从句也可用陈述语气。It is a pity that you cant swim.3.虚拟语气在其他场合的运用(1)虚拟语气在 as if/though，even if/though等引导的表语从句或状语从句中，如果从句
20、表示的动作发生在过去，用过去完成时；指现在状况，则用一般过去时(be 动词用 were)；指将来状况，则用 would/could/might动词原形。He spoke as if he had known it.You look as if you didnt care.Even if she were here，she could not solve the problem.(2)虚拟语气用于句型“It is (high) time (that).”中，从句的谓语动词用一般过去时(be 用 were)或“should动词原形” ，should 不可省略，意为“(现在)该” 。Its tim
21、e that I picked up/should pick up my daughter.7(3)虚拟语气用在 if only引导的感叹句中，对现在的虚拟用一般过去时(be 用 were)；对过去的虚拟用过去完成时。If only I were a pilot.If only I had taken his advice.(4)虚拟语气在一些简单句中的运用。情态动词的过去式用于现在时态时，表示说话人谦虚、客气、有礼貌或语气委婉，常出现在日常会话中。It would be better for you not to stay up too late.Would you be kind enou
22、gh to close the door?用于一些习惯表达法中。Would you like something to drink?I would rather not tell you.(5)would rather虚拟语气的用法。would rather sb.did sth.是对现在的虚拟；would rather sb.had done sth.是对过去的虚拟。1.表达的单调性例如在写一封回信向好友表达建议时，重复使用 You should.既显得单调，同时强硬的语气影响了交际效果。我们可以灵活多样地表达建议，如 Youd better./You might as well./Why
23、not.？等。2.情态动词搭配错误Error!Error!Error!.单句语法填空I cant find my purse.I could/might have left(leave) it in the supermarket yesterday，but Im not sure.(2018天津)解析 句意为：我找不到我的钱包了，昨天我有可能把它落到超市里了，但我不确定。根据句中时间状语 yesterday可知，是对过去发生事情的推测，故用“情态动词have done”，再根据后句 but Im not sure可知，此推测为不能肯定的推测，故用8could/might have done。
24、.单句改错(每小题仅有 1处错误)1.As a kid，I loved to watch cartoons，but no matter how many times I asked to watch them，my parents would not to let me.(2018全国)解析 would (not)表示“意愿”时后面直接跟动词原形，故把 to删除。2.Then he and my mother would have had a drink while she prepared dinner and they would talk about his day and hers.(
25、2016浙江)解析 根据语境可知，此处是描述的过去的一种习惯，故用 would do表示“过去常常做” 。would have done表示对过去事情的假设，意为“本来会做” 。3.Some classmates suggest we can 或 go to places of interest canshouldnearby.(2016全国)解析 suggest 表示“建议”时，后面的宾语从句的谓语动词要用 should do形式，should可以省略，故答案有两种改法。4.We must ways to protect our environment.(2015全国)foundfind解析
26、 情态动词后面要接动词原形。题组一 情态动词集训.单句语法填空1. I dont know where she is；she may be in Wuhan.2.The road is wet.It must have rained last night.3.You shall be punished if you cheat in the exam.4.Dont worry.Ive just sent an ambulance to you.They should be there any second.5.I should have gone to the school library，b
27、ut it rained heavily，so I did not.单句改错(每小题仅有 1处错误)1.You had better not to have stayed there，but you did.2.My punishment lasted a year.Meanwhile，I found out that with more patience I make my toys last.My attitude changed from then on.mustcould/might3.I have been practising for three weeks now，but I s
28、till get used to couldntcantitin fact，Ive nearly killed three people.94.Thank you for all you have done for me.Mom，though I may often say it，I notdo love you.5.Judging from what you said，he ought succeed. to题组二 虚拟语气集训.单句语法填空1.He walked in as if he had bought(buy) the school.And the word quickly got
29、around that he was from New York City.2.If you had told(tell) me the news yesterday，I wouldnt be so worried now.3.Sorry，I am too busy now.If I had(have) time，I would certainly go for an outing with you.4.He was very busy yesterday；otherwise he would have come(come) to the party.5.Its time that our g
30、overnment took/should take(take) measures to improve the quality of the buildings.6.Mr Li insisted that the sports meeting (should) be put(put) off because of the bad weather.单句改错(每小题仅有 1处错误)1.If I 10 years younger，I would start all over again.waswere2.If we had enough rain last year，we could have g
31、ained a good harvest. had3. I to be a teacher in the future，first of all，I would try my best to WasWeregive students lessons.4.George is going to talk about the geography of his country，but Id rather he more on its culture.focusesfocused5.The chairman demanded that people present every effort to pro
32、tect the mademakepolar bear against dying out.语法填空(情态动词和虚拟语气专练)Lucy is an outgoing lady.She 1.can play many kinds of musical instruments.Actually，she 2.could play the piano when she was 8 years old.Lucy also keeps taking exercise every day.She says that she has to do some sports because she 3.must k
33、eep slim.“You 4.shall get fat soon if you dont take exercise every day.” She usually says to her friends.10As for her，an elegant lady should try to keep fit.However，last week，she found that she 5.might put on weight and her husband suggested that she 6.should lose weight.And these days shed rather t
34、hat she 7.took(take) more exercise every day.However，she is always lacking in time because she has to take care of her children.One night after supper， she walked quickly in order to go dancing at the Tomorrow Park and she was late.On her way，she thought that the dancing must 8.have begun(begin)，and
35、 the coach 9.could have taught or shown many new moves.She was afraid that her friends might 10.have left(leave) before she got there.She was regretful then.She 11.should have had supper earlier，or she could have taken a taxi，and indeed she neednt 12.have taken(take) a bath in advance.When she reach
36、ed the park finally，she found nobody was there.She remembered suddenly that it had been reported on the radio that there would be a heavy rain that night.单句语法填空(一)1.While making great efforts to run away，she fell(fall) over the hill and died.2.Nervous and anxious，Jill failed to make(make) a good imp
37、ression at the job interview.3.The young firefighter insisted that he was(be) well-prepared and should be sent there to put out the fire.4.As the deadline is drawing near，no one shall leave with his own work uncompleted.5.I was watching(watch) TV alone in the living room when I suddenly heard a crac
38、k upstairs.6.To his surprise，Jack found his son dressed(dress) as Santa Claus on Christmas Eve.7.I still remember my happy childhood when my mother would take me to Disneyland at weekends.8.At a young age，he moved(move) to Spain and now plays professionally for the FC Barcelona.119.To make(make) it
39、easier to get in touch with us，youd better keep this card at hand.10.They were abroad during the months when we were carrying out the investigation，or they would have come(come) to our help.11.According to Charles Keeling，the amount of carbon dioxide increased(increase) sharply and steadily over the
40、 forty years between 1957 and 1997.12.You begin to understand how Chinese speakers have their thoughts organized(organize)，and how they understand things.13.It is required by law that a driving test (should) be taken(take) before a man gets a license.14.When you phoned me，I was having a meeting；how
41、I wish I had answered(answer) your call.15.They made up their minds that they would buy(buy) a new house once Larry changed jobs.16.Despite the previous rounds of talks，no agreement has been reached(reach) so far by the two sides.17.To return to the problem of water pollution，Id like you to look at
42、a study conducted(conduct) in Australia last year.18.The heartwarming story began in September last year when a woman asked the primary school in her neighborhood to accept(accept) her six-year-old son.19.Its true that our future is determined(determine) by many things.20.Raised(raise) in the poores
43、t area of Glasgow，he had a long，hard road to becoming a football star.(二)21.The parents were delighted to find that the housework had been done(do) by their son independently.22.Its said that these regulations were made to protect(protect) children.23.I should not have laughed if I had thought(think
44、) you were serious.24.When some waste chemicals are put(put) into the sea，it can hurt or kill animals and fish.25.Having been bitten(bite) twice，the postman refused to deliver our letters unless we chained our dog up.26.Scientists have discovered that staying(stay) in the cold could help us lose 12w
45、eight.27.When the time came for me to say goodbye to my friends in the village，I wanted to reward the old woman for the trouble I had caused(cause) for her.But she refused.28.Animals that are able to copy sounds may enjoy practicing(practice) new sounds.When they are kept outside of their natural en
46、vironment，they may copy unusual sounds.29.A major accident in southern Sweden happened today.Its reported that this afternoon a ship crashed into a bridge.Unluckily，seven cars and six trucks are said to have fallen(fall) into the water.30.It is an activity held(hold) by an American charity organizat
47、ion.31.No physical cause could be found(find).Finally the doctor said to the man， “Unless you tell me whats on your conscience，I can t help you.” 32.This allowed people to have(have) a day or two out now and then，which gave them a taste for leisure and seaside.33.Mrs Woo Mei Fong said that her husba
48、nd had just left for work when she felt(feel) that her house was moving.She ran outside at once with her children.34.In the spring，snow melts(melt) and the workers start working again.35.Anxiously，she took the dress out of the package and tried it on，only to find(find) it didnt fit.36.In most cases，
49、a healthy diet can help you decrease the risk of getting(get) some diseases like diabetes and cancer.37.He agreed to our suggestion that we (should) put (put) on a play at the English Evening.38.It is reported that his new book will be published(publish) by that company next year.39.Though they did all they could to help(help) them，times were tough for them.40.It remains to be seen(see) whether you can get a better education，even if you are in a private high schoo
