高考英語一輪復習 語法精講系列 講座五 情態(tài)動詞和虛擬語氣課件
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1、語法精講系列講座五情態(tài)動詞和虛擬語氣講座五情態(tài)動詞和虛擬語氣語 法 精 講一、情態(tài)動詞考點一情態(tài)動詞的基本用法1can和could的用法(1)表示“能力”。No one can be compared with Yao Ming in playing basketball.Oh,you are really his big fan.在打籃球方面,無人能與姚明相媲美。你真是姚明的鐵桿粉絲。(2)表示禮貌地請求別人做某事或允許別人做某事,意為“能,可以”。What should I wear to the party?Well,it isnt very formal.You can wear wh
2、atever you like.晚會我應該穿什么?晚會不太正式,你可以穿自己喜歡的任何衣服。(3)表示驚訝,常用在否定句和疑問句中。How could you do such a silly thing?你怎么能做那樣的蠢事呢?2may和might的用法(1)may和might表示“許可”。May I take the book out?Im afraid not.我能將書帶出去嗎?恐怕不行。(2)You may come if you wish.你想來就來吧。3must的用法(1)表示必要性,意為“必須”。The children must be back by 4 oclock.孩子們必須
3、4點鐘以前回來。Shall I inform him of the change of the schedule right now?I am afraid you must,in case he comes late for the meeting.我現(xiàn)在通知他日程表的變動嗎?恐怕你必須通知他,以免他開會遲到。(2)表示禁止(用于否定句)。You mustnt park here!Its an emergency exit.你不可以在這兒停車!這是緊急情況出口處。4shall和should的用法(1)shall的用法用于第一、第三人稱疑問句中,表示說話人征求對方的意見或向?qū)Ψ秸埵尽hall
4、 I go out for a walk after supper?晚飯后我可以散散步嗎?shall與第二、三人稱連用,用于陳述句中,表示說話者的意志,用來表達說話者給對方以命令、指示或允諾。此外,當宣布法律、規(guī)定時,也用shall來表達。如:Will you read me a story,Mummy?OK.You shall have one if you go to bed as soon as possible.媽媽,給我講個故事好嗎?好,如果你盡快上床睡覺,我就給你講一個。(允諾)It has been announced that candidates shall remain i
5、n their seats until all the papers have been collected.已宣布,在所有試卷收上來之前,應試者必須留在自己的座位上。(規(guī)則或規(guī)定)(2)should的用法should意為“(義務上)應該”,在語氣上比must(必須)弱?!皊hould動詞原形”表示現(xiàn)在或?qū)響摗H纾篒 should go and visit him this afternoon,but I wonder if I will be free.今天下午我應該去看望他,但我不知道我是否有空。(表示將來應該)The children should be taken good car
6、e of.這些孩子應該受到好的照顧。5will和would的用法(1)表示意志、意愿和決心,would用于過去的情況。I have told him again and again to stop smoking,but he will not listen.我已再三告訴他戒煙,但是他就是不聽。You can stay here as long as you can,if you will.如果你愿意,你能在這里待多長時間就待多長時間。(表示主語的意愿)Mr.Gordon asked me to remind you of the meeting this afternoon.Dont for
7、get it!OK,I wont.(表示決心)戈登先生讓我提醒你今天下午有會議。可別忘了!好的,我不會忘的。(2)will(wont)可用來敘述真理,還可敘述目前的習慣,would(wouldnt)可以用來敘述過去的習慣。如:Oil will float on water.油能浮在水面上。Engines wont run without lubricants.沒有潤滑劑發(fā)動機就不能運轉(zhuǎn)。She will listen to records alone in her room for hours.她獨自一人在屋里聽唱片,常常一聽就是幾個小時。He would spend hours in the
8、 bathroom or on the telephone.他以前一進洗澡間或是一打電話,往往就是幾個小時。特別注意:would和used to都可表示過去的習慣,但前者表示過去反復的動作,常與every day,often,frequently等連用;后者表示過去的狀態(tài)或過去的習慣,但現(xiàn)在已不存在。如:When he was abroad,he would read as many books as possible.在國外時,他總是盡可能多讀書。She doesnt get up so early as she used to.她不像以前那樣起得那么早了。6need和dare的用法need
9、和dare兩者既可用作情態(tài)動詞也可用作實義動詞。作實義動詞時,有人稱和數(shù)的變化,可用于肯定句、否定句或疑問句中,構(gòu)成否定句或疑問句時要用助動詞do,does,did;作情態(tài)動詞時,沒有人稱和數(shù)的變化,直接接動詞原形,只用于否定句和疑問句中,構(gòu)成否定句和疑問句時不用助動詞。另外,dare作情態(tài)動詞時,還可用于條件句中,過去式為dared;作實義動詞時,dare常用于疑問句或否定句,后面的to也可省略;I dare say是習慣說法,意為“我想,大概”。如:He neednt do it.(情態(tài)動詞)He doesnt need to do it.(實義動詞)他不必做這件事。I didnt kno
10、w whether he dared say that to him.(情態(tài)動詞,有時態(tài)變化)我不知道他是否敢對他說那話。He didnt dare(to) do it.(實義動詞)He dared not do it.(情態(tài)動詞)他不敢那么做??键c二情態(tài)動詞表示推測的用法1can用于肯定句中表示客觀的可能性,意為“有時會”。Accidents can happen on such rainy days.這樣的多雨天氣可能會發(fā)生事故。(客觀的可能性)can用于否定句中表推測時,語氣較強。如:After what had happened he could not continue to wor
11、k there.鑒于所發(fā)生的事情,他不可能繼續(xù)在那里工作下去了。You cant mistake their car;its got a bright red line all over it.你不可能會認錯他們的車,那輛車上有道亮紅色的條紋。can,could在疑問句中,常表示困惑、不相信等。如:Theres someone outsidewho can it be?外面有人會是誰呢?What can they be doing?他們可能在干些什么呢?Could he be serious?他當真是這個意思嗎?Where can she have put it?她能把它放在哪兒呢?2may/
12、might用于肯定句中可以用來表示不十分肯定的推測,意為“有可能”;用于否定句中也可以表示推測,may not意為“可能不”,表示一種不太確定的語氣。The traffic is heavy these days.I might arrive a bit late,so could you save me a place?這些天交通很繁忙,我可能會來晚一點兒。請你幫我保留個位置好嗎?3must表示推測時只能用于肯定句中,意為“一定,必定”,表示十分肯定的語氣(在疑問句中或否定句中要用can/could)。Its the office!So you must know eating is not
13、 allowed here.Oh,sorry.這是辦公室!所以你一定知道這里不許吃東西。噢,對不起。4should用來表示推測時意為“應該”,即含有“按道理來說應當如此”的意思。There shouldnt be any difficulty passing the road test since you have practised a lot in the driving school.因為你在駕校訓練了那么多,通過路考應該沒什么困難??键c三情態(tài)動詞的特殊用法1cannot butdo sth.表示“不得不/只好做某事”。如:I could not but admit that he wa
14、s right and I was wrong.我不得不承認他對了,我錯了。I cannot choose but go.我只好去。2cannot/can never.enough/too.表示“再也不為過”。You cannot be careful enough to cross the road.過馬路時你怎么小心都不為過。3may可以用于祈使句,表示祝愿。如:May we never forget each other.愿我們彼此永不相忘。May you return in safety.愿你平安歸來。4may well和may as well結(jié)構(gòu)。(1)“may well動詞原形”是
15、一種常用結(jié)構(gòu),意為“完全能,很可能”,相當于“be very likely to do”。如:He may well be proud of his son.他大可為他的兒子感到自豪。Her appearance has changed so much that you may well not recognize her.她的模樣變化太大,你很可能認不出她了。(2)“may as well動詞原形”意為“最好,倒不如”。如:You may as well do it at once.你最好馬上就做這件事。We may as well stay where we are.我們留在現(xiàn)在的地方倒也
16、不錯。5“should”有時表示說話人對某事不能理解,感到意外、驚異等,意為“竟會”。如:Its odd that she should think I would want to see her again.她竟然認為我會想再次見到她,真奇怪。6must表示“偏要、硬要”。如:If you must go,at least wait until the storm is over.如果你偏要走,你至少要等到暴風雨停止。Must you make so much noise?你非得弄出這么大聲響嗎?考點四“情態(tài)動詞have done”的用法1should/ought tohave done表示
17、“過去本應該做而(實際)沒有做的事情”,含有責備或遺憾的語氣,意為“本應該”。其否定形式為“should not/ought not tohave done”,表示某種行為本不該發(fā)生但實際上發(fā)生了。You ought to have done this exercise more carefully.你本應該更仔細地做這個練習。You shouldnt have told her the truth.你本不該告訴她真相。2musthave done,用于肯定句,表示“過去一定做過某事”,是一種很有把握的推測。注意:對過去發(fā)生的情況的否定推測常用“cant/couldnthave done”表示
18、。Ye Shiwen won two gold medals in London Olympic Games.She must have gone through tough training.葉詩文在倫敦奧運會上獲得了兩枚金牌。她肯定受過嚴格的訓練。It must have rained last night,for the road is quite muddy.昨晚一定下雨了,因為路很泥濘。3may/mighthave done是對過去情況的一種不太有把握的推測,表示“可能已做了某事”,否定句表示“可能還沒有”。Sorry,Im late.I might have turned off
19、the alarm clock and gone back to sleep again.對不起,我遲到了。我可能把鬧鐘關(guān)掉后又睡著了。4couldhave done表示“過去本來可以做,但實際上沒有做”;can/couldhave done表示“過去可能做過”。I could have saved the poor rabbit,but I didnt have the right drugs with me at that moment.我本來可以拯救那只可憐的兔子的,可是我當時沒有合適的藥品。5neednthave done表示“過去沒有必要做某事,但實際上做了某事”。Mark need
20、nt have hurried.After driving at top speed,he arrived half an hour early.馬克本沒必要那么匆忙。他以最快速度開車,結(jié)果早到了半個小時。You neednt have taken a taxi here,for it was very near to my house.你本來不必打車來這里的,因為這里離我家很近。二、虛擬語氣考點一虛擬語氣在條件句中的用法1if條件句if條件從句從句的謂語形式主句的謂語形式與現(xiàn)在事實相反的假設動詞過去式(be的過去式用were)should/would/could/might動詞原形與過去事實
21、相反的假設had過去分詞should/would/could/mighthave過去分詞與將來事實相反的假設should動詞原形動詞過去式were to動詞原形should/would/could/might動詞原形(1)與現(xiàn)在事實相反If I were you,I should seize the chance to go abroad.如果我是你,我就抓住這次出國的機會。(2)與過去事實相反If you had taken my advice,you would not have failed in the exams.如果你早聽了我的建議,你考試就能通過了。(3)與將來事實相反If he
22、 should not come tomorrow,we should put off the meeting till next Monday.如果明天他不來,我們就把會議推遲到下周一。2錯綜時間條件句當條件狀語從句表示的行為和主句表示的行為所發(fā)生的時間不一致時,被稱為“錯綜時間條件句”,動詞的形式要根據(jù)它所表示的時間做出相應的調(diào)整。I actually believe that we would be in Xian now if you hadnt been caught drunk driving last month.事實上,我認為如果上個月你沒因酒駕被逮住的話,我們現(xiàn)在就在西安呢。
23、特別注意:如果虛擬條件句中含有were/had/should,有時可把if省略,將were/had/should提至主語之前,形成倒裝句。否定形式的not不可提到主語前。Had you taken my advice,you wouldnt have failed in the examination.如果你聽了我的建議,你就不會考試不及格了。Should it rain tomorrow,we would have to cancel the football match.如果明天下雨,我們將不得不取消足球賽。Were it not for the expense,I would go ab
24、road now.如果不是因為費用問題,我現(xiàn)在就出國了。3含蓄條件句有時假設的情況并不用條件從句表示,而是由otherwise,if only,but,or,without,but for等來引導或者通過上下文表示。If only I had taken your advice.我要是聽了你的建議就好了。 But for your help,we couldnt have finished the work ahead of time. 沒有你的幫助,我們是不可能提前完成這項工作的。 He telephoned to inform me of your birthday,or/otherwis
25、e I would have known nothing about it. 他打電話通知了我你的生日,否則,我對此一點兒都不知道。 I would have come sooner but I didnt know that they were waiting for me. 我本該早一些到,但我不知道他們在等我。 I wish (that) I were a bird and could fly freely in the sky. 我希望我是只小鳥,能在天空自由飛翔。 I wish(that) I had met that film star yesterday. 我希望昨天見到那個影星
26、了。 How I wish it werent raining now. 我多希望現(xiàn)在沒下雨啊。 (2)用于表示建議、愿望、命令等動詞后的賓語從句中,常見的動詞有:demand,order,require,insist,suggest,propose,advise,request,urge,command,prefer,desire,recommend等。賓語從句中的虛擬語氣結(jié)構(gòu)為“should動詞原形”,should可以省略。如: He suggested that we(should) start off early the next day. 他建議我們第二天早點出發(fā)。 They ins
27、isted that the boy(should) go with them. 他們堅決主張那個男孩子跟他們一起去。 此類動詞記憶小竅門: 一堅持(insist) 二命令(order,command) 三建議(advise,suggest,propose) 四要求(require,request,demand,desire) 特別注意:當suggest表示“暗示,表明”之意,insist表示“堅持說”之意時,suggest/insist后的賓語從句不使用虛擬語氣,應使用陳述語氣。如: The smile on his face suggested that he was satisfied
28、with our work. 他臉上的微笑表明他對我們的工作很滿意。 The man insisted that he had never stolen the money. 那個人堅持說他沒有偷錢。 2虛擬語氣在主語從句中的用法 It is desired/suggested/proposed/recommended/necessary/important/ strange/natural/a pity/essentialthat從句,從句的謂語動詞用“should動詞原形”,should可以省略。如: It is suggested that the meeting (should) be
29、 put off till next week. 人們建議會議推遲到下周。 It is strange that he (should) have acted toward his parents like that.(從句謂語動詞的動作在主句謂語動詞的動作之前發(fā)生時,要用“should have過去分詞”) 真奇怪他竟然那樣對他父母。 3用于表語從句和同位語從句中 在suggestion,proposal,order,plan,idea,request,advice等名詞后的表語從句和同位語從句中要用虛擬語氣,其構(gòu)成是“should動詞原形”,should可以省略。如: My idea is
30、 that we (should) think it over before accepting it. 我的意見是在接受之前我們要反復考慮。 We all agreed to his suggestion that we (should) go to Dalian for sightseeing. 我們都同意他讓我們?nèi)ゴ筮B旅游的建議。 4虛擬語氣在定語從句中的用法 在It is(high/about)time (that).句型中,定語從句中的謂語動詞用過去式,或用should動詞原形(should通常不省略)。此句型意為“(現(xiàn)在)該”,用來表示提議。 It is (high) time that you went to school. 你該去上學了。 5as if/as though引導的表語從句和方式狀語從句常用虛擬語氣 He stood up and offered her his seat,as if he had read her mind. 他站起來給她讓座,他好像讀懂了她的心思。 特別注意:如果表示的事情可能會發(fā)生,那么從句中的謂語動詞可用陳述語氣。 It looks as if its going to rain. 天看上去似乎要下雨。
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