情態(tài)動(dòng)詞need用法匯總

1、 .DOC資料. need”HYPERLINK /search?word=%CB%AB%D6%D8%BD%C7%C9%AB&fr=qb_search_exp&ie=utf8雙重角色的用法及其區(qū)別“need”既可以作HYPERLINK /search?word=%C7%E9%CC%AC%B6%AF%B4%CA&fr=qb_search_exp&ie=utf8情態(tài)動(dòng)詞，也可以作HYPERLINK /search?word=%CA%B5%D2%E5%B6%AF%B4%CA&fr=qb_search_exp&ie=utf8實(shí)義動(dòng)詞，但是它們的用法不同。作為HYPERLINK /search?word=

2、%C7%E9%CC%AC%B6%AF%B4%CA&fr=qb_search_exp&ie=utf8情態(tài)動(dòng)詞的“need”的用法與其他情態(tài)動(dòng)詞“can”，“may”，“must”的用法基本相同：在HYPERLINK /search?word=%CF%DE%B6%A8%B6%AF%B4%CA&fr=qb_search_exp&ie=utf8限定動(dòng)詞詞組中總是位居第一，沒有非限定形式，即沒有HYPERLINK /search?word=%B2%BB%B6%A8%CA%BD&fr=qb_search_exp&ie=utf8不定式、-ing分詞或-ed分詞等形式；HYPERLINK /search?wo

3、rd=%B5%DA%C8%FD%C8%CB%B3%C6%B5%A5%CA%FD&fr=qb_search_exp&ie=utf8第三人稱單數(shù)現(xiàn)在時(shí)沒有詞形變化；情態(tài)動(dòng)詞之間是相互排斥的，即在一個(gè)HYPERLINK /search?word=%CF%DE%B6%A8%B6%AF%B4%CA&fr=qb_search_exp&ie=utf8限定動(dòng)詞詞組中只能有一個(gè)情態(tài)動(dòng)詞。下面是“need”作為情態(tài)動(dòng)詞的用法：一、need表示“需要”或“必須”，通常用于HYPERLINK /search?word=%B7%F1%B6%A8%BE%E4&fr=qb_search_exp&ie=utf8否定句和疑問句

4、。例如：1You neednt do it again你不需要再做了。2He neednt worry about it這件事他無需擔(dān)心。3Need he do this homework first？他需要先做這些作業(yè)嗎？4Need they fill in the form？他們需要填表嗎？二、在HYPERLINK /search?word=%B7%F1%B6%A8%BE%E4&fr=qb_search_exp&ie=utf8否定句中，可以用need的否定形式HYPERLINK /search?word=%B2%BB%B6%A8%CA%BD&fr=qb_search_exp&ie=utf8

5、不定式完成體。例如：1We neednt have worried其實(shí)我們不必要慌。2You neednt have mentioned it你本來不必提起這件事。3You neednt have said that when he asked當(dāng)他問的時(shí)候，你其實(shí)不必要說。三、neednt后的HYPERLINK /search?word=%B2%BB%B6%A8%CA%BD&fr=qb_search_exp&ie=utf8不定式間或也能用HYPERLINK /search?word=%BD%F8%D0%D0%CA%BD&fr=qb_search_exp&ie=utf8進(jìn)行式或HYPERLINK

6、 /search?word=%B1%BB%B6%AF%D3%EF%CC%AC&fr=qb_search_exp&ie=utf8被動(dòng)語態(tài)。例如：1He neednt be standing in the rain他不必要站HYPERLINK /search?word=%D4%DA%D3%EA%D6%D0&fr=qb_search_exp&ie=utf8在雨中。2We neednt be waiting in this place我們不必要在這兒等。3The hedges neednt be trimmed thisweek本周樹蘺不必要整修?！皀eed”作為HYPERLINK /search?w

7、ord=%CA%B5%D2%E5%B6%AF%B4%CA&fr=qb_search_exp&ie=utf8實(shí)義動(dòng)詞時(shí)，通常用法是：人need to do物need doing物need to be done另外，“need”后還可以直接跟名詞。請(qǐng)看下面的例子：1We need to collect the parcel before we leave for England去英國之前，我們需要收拾好行李。2We need to tell him the truth我們需要告訴他真相。3My car needs repairing我的汽車需要修理。4The flowers need wateri

8、ng這些花需要澆水。5His leather shoes needs to be mended他的皮鞋需要修補(bǔ)。6Her room needs cleaning她的房間需要打掃。7It is aquestion that needs very careful consideraton這是一個(gè)需要慎重考慮的問題。8I need a watch我需要一塊手表。need 作情態(tài)動(dòng)詞：1)不能單獨(dú)作謂語, 只能和其他動(dòng)詞原形構(gòu)成謂語；2)在句中放在謂語動(dòng)詞之前, 謂語動(dòng)詞前若有助動(dòng)詞,則在助動(dòng)詞之前；疑問句中, 則在主語之前。3)多用在否定句或疑問句中；4)無人稱和數(shù)的變化；5)否定式構(gòu)成是在后面加

9、not。Need I attend the meeting tomorrow?我需要明天參加會(huì)議嗎?You need not hand in the paper this week.這一周你不必交論文。You didnt need to tell him the news; it just made him sad.你無需告訴他這一消息, 那只會(huì)使他悲哀。二、need作實(shí)義動(dòng)詞時(shí)： need 就像其他動(dòng)詞一樣,有第三人稱,單復(fù)數(shù), 后面加帶 to 的動(dòng)詞等特性。I need a bike to go to school.我上學(xué)需要一輛自行車。Do you need a dictionary?

10、你需要詞典嗎?She needs a necklace.她需要一條項(xiàng)鏈。neednt + have + 過去分詞 表示“過去做了沒必要做的事情。 ”You neednt have taken it seriously.這件事情你不必太認(rèn)真。情態(tài)動(dòng)詞need的用法作為情態(tài)動(dòng)詞，need一般只用于否定句和疑問句中。You neednt try to explain. 你不需要解釋。She neednt come tomorrow. 她明天不必來。Need we stay here this evening? 今晚我們需要在這兒住下來嗎？Need 作為實(shí)意動(dòng)詞比作為情態(tài)動(dòng)詞常用的多。實(shí)意動(dòng)詞need

11、 可用在所有句型中。She needs to come tomorrow. 明天她需要來。You dont need any help from others. 你不需要?jiǎng)e人的任何幫助。He doesnt need to borrow money. 他不需要借錢。Do they need this? 他們需要這個(gè)嗎？Plants need sun light in order to grow. 植物需要陽光才能生長(zhǎng)。You dont need to work so hard. 你不需要這么樣地努力工作。Your shoes need cleaning/to be cleaned. 你的鞋子需要

12、清潔。The job doesnt need much attention or time. 這份工作很省心省事。What he needs is a good beating. He needs a good beating. 需要好好揍他一頓need的用法作情態(tài)動(dòng)詞：通常用在疑問句、否定句中，或與條件句、whether, hardly, nobody等連用。如：Need he go so soon?他這么快就要走嗎?He neednt go. 他不必走。If she wants anything, she need only ask. 她想要什麼, 只需說一聲就行。He wondered

13、whether they need go there. 他不知道他們是否需要去那里。Nobody need be afraid of catching the disease. 誰都不用害怕能得這種病. 注意：1. 因 need 不能用于肯定句，因此肯定回答要用 must。如：Need I stay here any longer? 我需要在這呆下去嗎？No, you neednt. 不需要。Yes, you must. 是的，需要呆下去。2. need have done 的否定式或疑問式，表示“本來不必做某事，但事實(shí)上卻做了”。如：She neednt have come in perso

14、n a call would have been enough. 她本不必親自來打個(gè)電話來就足可以了。Need you have paid so much?你當(dāng)時(shí)真須要付那麼多錢嗎?作行為動(dòng)詞：可用于疑問句、否定句和肯定句。如：Does he need to go so soon?他這么快就要走嗎?He doesnt need to go. 他不需要走。He needs to go. 他想走(from )。They need our help. 他們需要我們幫助。注：作行為動(dòng)詞的need后可接動(dòng)名詞的主動(dòng)式表示被動(dòng)含義。如：The garden needs watering(=to be wa

15、tered) . 花園該澆水了。還可作名詞：表示“需要, 必需, 必需品”等。如：The doctor told me I was in need of a good rest. 醫(yī)生說我需要好好休息。There is no need for you to go. 你沒有必要去。Our needs are modest. 我們的必需品是謙虛1. 基本用法特點(diǎn)need可用實(shí)意動(dòng)詞和情態(tài)動(dòng)詞，用作情態(tài)動(dòng)詞時(shí)，意思是“有必要”或“需要”，其后接動(dòng)詞原形，通常只用于否定句或疑問句以及if或whether之后，一般不用于肯定句。如：You neednt worry. 你不必?fù)?dān)心。Why need you

16、 go today？ 為什么你需要今天走？He wondered whether they need send a deposit. 他不知道他們是否得交定金。注（1） 由于用作情態(tài)動(dòng)詞的need通常不用于肯定句，所以對(duì)于以need開頭的疑問句的否定回答可用neednt，但是肯定回答卻不能用Yes， you need之類的，應(yīng)根據(jù)具體情況改用其他表達(dá)。如：Need he stay here？ Yes， he must. “他有必要留在這兒?jiǎn)?？”“是的，必須留在這兒?！保?） need有時(shí)用于含有only， all 等表限制意義的肯定句中。如：This is the only form you

17、need fill in. 你要填的只有這一張表。All you need do is to take a taxi from the airport. 你只需從機(jī)場(chǎng)打個(gè)的即可。2. 后接動(dòng)詞完成式的用法若要談?wù)撨^去情況，應(yīng)在其后接動(dòng)詞完成式。如：You neednt have come in person. 你當(dāng)時(shí)不必親自來的。Need you have paid so much？ 你當(dāng)時(shí)真需付那么多錢嗎？注（1） 在賓語從句中可直接用need表示過去（也可用didnt have to）。如：He said he need not didnt have to hurry. 他說他不必匆忙。（

18、2） 注意對(duì)“need+have+過去分詞”結(jié)構(gòu)疑問式的回答。如：Need he have come so early？ Yes， he had to. / No， he neednt have.“他來那么早有必要嗎？”“有必要，他必須來那么早?！?“不，他本來沒有必要來那么早的?！?. 后接動(dòng)詞進(jìn)行式的用法有時(shí)后接進(jìn)行式表示動(dòng)作正在進(jìn)行。如：We neednt be standing here in the rain. 我們沒有必要站在這里被雨淋。4. neednt have done與didnt need to do前者主要表示某事已經(jīng)做了，但后來覺得沒必要去做，因此常含有責(zé)備或遺憾之意；

19、后者則不具體表明某事是否做了（即可能做了也可能沒有做，此用法中的need為實(shí)意動(dòng)詞）。如：I got up early， but I neednt have done so， because I had no work to do that morning. 我起床起得很早，但我本來不必起那么早的，因?yàn)槲夷翘煸缟蠜]什么事做。I didnt need to get up early this morning， so I stayed in bed until 9 am. 今天早上我不必早起，所以我一直睡到上午九點(diǎn)鐘才起床。若沒有特定的上下文，有時(shí)可能有歧義。如：I didnt need to g

20、o the office yesterday.（1） 我昨天無需去那兒。（所以沒去）（=I didnt have to go there yesterday.）（2） 我昨天本來不必去那兒的。（但我卻去了）（=I neednt have gone there yesterday.）need和dare的用法要點(diǎn)need和dare可用作實(shí)義動(dòng)詞和情態(tài)動(dòng)詞，用作實(shí)義動(dòng)詞時(shí)，后接動(dòng)詞要用不定式，有人稱和數(shù)的變化，可用肯定句、否定句和疑問句；用作情態(tài)動(dòng)詞時(shí)，主要用于否定句和疑問句中，沒有人稱和數(shù)的變化，后接動(dòng)詞要用動(dòng)詞原形。如：You need not payit is free. 你不必付錢，這是免費(fèi)

21、的。We need to have lots of patience. 我們需要有很大的耐心。Who would dare to tell him? 誰會(huì)敢告訴他? He dared not go there at night. 晚上他不敢到那里去。How dare you ask me such a question? 你怎么敢問我這樣的問題? 注：need 表示“需要”，其后可接動(dòng)名詞，且要用主動(dòng)形式表示被動(dòng)意義。如：The room needs cleaning. 這房間需要打掃了。need表示“需要”或“必須”，通常用于否定句，疑問句，條件句。例如：1You neednt do it

22、again你不需要重復(fù)做了。2He neednt worry about it這件事他無需擔(dān)心。3Need he do this homework first？他需要先做這些作業(yè)嗎？4Need they fill in the form？他們需要填表嗎？二、在否定句中，可以用need的否定形式+不定式完成體。例如：1We neednt have worried其實(shí)我們不必?fù)?dān)心。2You neednt have mentioned it你本來不必提起這件事。3You neednt have said that when he asked當(dāng)他問的時(shí)候，你其實(shí)不必要說。三、neednt后的不定式間或

23、也能用進(jìn)行式或被動(dòng)語態(tài)。例如：1He neednt be standing in the rain他不必要站在雨中。2We neednt be waiting in this place我們不必要在這兒等。3The hedges neednt be trimmed this week本周樹蘺不必要整修。四、其一般疑問句的答語，肯定用must，否定用neednt。Need I go with her? 我需要和她一起去嗎？Yes,you must. 是的，你需要去。No,you neednt. 不，你不必去。作實(shí)義動(dòng)詞主+need +to do主+need +doing =sth+need +t

24、o be done（都是實(shí)義動(dòng)詞，注意其否定為主+dont/doesnt+need +to be done或主+neednt +be done例如：The room needs cleaning = The room needs to be cleaned. 房間需要打掃了。另外，“need”作實(shí)義動(dòng)詞時(shí)后還可以直接跟名詞。請(qǐng)看下面的例子：It is a question that needs very careful consideration這是一個(gè)需要慎重考慮的問題很簡(jiǎn)單的方法區(qū)別情態(tài)動(dòng)詞與實(shí)義動(dòng)詞：當(dāng)need為情態(tài)動(dòng)詞時(shí)，意思是“必要”，否定為neednt，后面大多接動(dòng)詞原形，表示動(dòng)作

25、；當(dāng)need為實(shí)義動(dòng)詞時(shí)，意思是“需要”，否定為dont need,后面大多跟名詞。詞匯搭配+名詞need clothes 需要衣服need education 需要受教育need food 需要食物need help 需要幫助need money 需要錢need rice 需要大米need water 需要水+副詞need critically 極為重要地需要need desperately 不顧一切地需要need directly 直接地需要need economically 經(jīng)濟(jì)上地需要need genuinely 真正地需要need horribly 驚人地需要need imperat

26、ively 緊急地需要need sorely 非常需要need spiritually 精神上需要need urgently 強(qiáng)烈地需要+介詞need for 為而需要need in 在需要詞語辨析need,want這組詞都有“需要，要求”的意思。其區(qū)別是：need表示因缺少而需要某物或需要做某事，尤其強(qiáng)調(diào)這種需要的迫切性； want表示從一般需要的意向到強(qiáng)烈、迫切的要求以及各種程度不同的愿望。need作情態(tài)動(dòng)詞的用法：need用作情態(tài)動(dòng)詞時(shí)表“必須必要”的意思，后直接跟動(dòng)詞原型，且need無人稱、數(shù)的變化（第三人稱單數(shù)不加s），也沒有非謂語形式（不定式、分詞）。注意:need用作情態(tài)動(dòng)詞時(shí)常

27、用于否定句和疑問句中。例：Need he bring his laptop tomorrow? 明天他必須帶他的筆記本過來嗎？Come on, you neednt worry about it becuse its not your fault. 行啦，你不必?fù)?dān)心的因?yàn)槟遣皇悄愕腻e(cuò)。She neednt have arrived so early, need she? 她本不必到得這么早，不是嗎？注意:must引導(dǎo)的一般疑問句的否定回答必須使用neednt。例如：-Must I leave? 我必須離開嗎？-No, you neednt. 不，你不必離開。二、need作實(shí)意動(dòng)詞的用法：1、n

28、eed + something 需要某物例：I need some fruits to eat. 我需要些水果來吃。2、need to do something 需要做某事例：You dont need to have the bike repaired right away. 你不必馬上去修車。3、need doing = need to be done 需要例：The room needs cleaning = The room needs to be cleaned. 房間需要打掃了。4、need somebody to do something 需要某人做某事例：I need some

29、one to help me out of this problem. 我需要找人來幫助我解決這個(gè)問題。三、need作名詞的用法：need用作名詞時(shí)，既可以是可數(shù)名詞，也可以是不可數(shù)名詞。主要常用句型如下：1、(Theres) no need to do something 沒必要做某事例：Theres no need to cover such a long distance. 沒必要走那么遠(yuǎn)的距離。Theres no need for me to break the window because I have the key. 我沒必要打破窗戶因?yàn)槲矣需€匙。No need to run s

30、ince were not pressed for time. 不必跑啦，我們 又不趕時(shí)間。也可以單獨(dú)使用：Theres no need. 意思是“沒有必要”。2、in (great) need of （非常）需要例：The rescue team is in great need of medicine. 救援小組非常需要藥品。3、if need be 如果需要的話例：If need be, Im going to do you a favor. 如果需要的話我會(huì)幫你的。四、關(guān)于need的一些短語、俚語用法。1、A friend in need is a friend indeed. 患難之

31、交才是真朋友。 could+have+過去分詞”的10種用法一、表示主觀猜測(cè)即對(duì)已經(jīng)發(fā)生動(dòng)作或已經(jīng)存在的狀態(tài)作出主觀上的猜測(cè)，通?？勺g為“可能(已經(jīng))”，有時(shí)需根據(jù)具體語境來HYPERLINK /interpretation/翻譯。如：We could not have heard them because of the noise from the river. 由于有河水聲我們不能聽見他們的話。Tom could have taken the money; he was here alone yesterday. 有可能是湯姆把錢拿走了，昨天他單獨(dú)一個(gè)人在這里呆過。We knew he c

32、ouldnt have paid for it, because he had no money. 我們知道不可能是他付了這筆錢，因?yàn)樗麤]錢?！菊f明】該用法也可將could換成can，但這只限于否定句和疑問句，因?yàn)閏an表推測(cè)時(shí)不用于肯定句(而could可以用于肯定句)。如：Can he have left already? 他會(huì)已經(jīng)離開了嗎?They cant have gone out because the lights on. 他們不可能出去了，因?yàn)闊暨€亮著。二、表示未曾實(shí)現(xiàn)的能力即表示過去本來有能力可以做某事的，但實(shí)際上沒有那樣去做，通常譯為“本來可以”“本來能夠”等。如：The w

33、orst of it is that I could have prevented the accident. 最糟糕的是我本來可以防止這次事故的。We could have got in for nothingnobody was collecting tickets. 我們本可以不買票就進(jìn)去根本沒人收票。I could have passed my examination easily but I made too many stupid mistakes. 我本可以輕易通過考試，但我犯了太多不該犯的錯(cuò)誤。有時(shí)用于反語。如：Youve broken my penthanks for not

34、hing, I could have done that for myself. 你把我的筆給弄壞了你得了吧，就那我自己也會(huì)弄。三、表示未曾實(shí)現(xiàn)的可能性即表示過去本來可能發(fā)生的情況，而實(shí)際上沒有發(fā)生，通常譯為“本來可以”“本來可能”等。如：She could have been seriously injured. 她本來可能傷得很重的。Its difficult enough, but it could have been worse. 這事情夠困難的了，本來可能會(huì)更糟呢。有時(shí)也可根據(jù)語境譯為“好在沒有”“差點(diǎn)”，尤其是當(dāng)談?wù)摰氖恰安缓谩钡那闆r時(shí)。如：She felt miserable.

35、She could have cried. 她感到很痛苦，她差點(diǎn)哭了。That was a bad place to go skiingyou could have broken your leg. 那不是一個(gè)滑雪的好地方，好在你沒有把腿給摔斷。Why did you throw the bottle out of the window? Somebody could have been hurt. 你為什么把瓶子扔出窗外呢? 好在沒有砸傷人。They were luckythey could have been killed. 他們很幸運(yùn)，差點(diǎn)被打死了。Did you see him fal

36、l? He could have killed himself. 你看見他摔倒了嗎? 他差點(diǎn)摔死了。有時(shí)需要有比較靈活的HYPERLINK /interpretation/翻譯：When I discovered Id come for the appointment on the wrong day, I could have kicked myself. 我來赴約發(fā)現(xiàn)把日期弄錯(cuò)了，感到非常懊惱。四、表示未曾實(shí)現(xiàn)的想法即表示過去本來有做某事的打算或意圖，但實(shí)際上沒有實(shí)現(xiàn)，通常譯為“本來可以”。如：I could have lent you the money. Why didnt you a

37、sk me? 我本來可以借這筆錢給你的。你為什么不向我提出?I could have given you some hints, but I suppose you thought yourself too grand. 我本可以給你點(diǎn)提示的，但是我認(rèn)為你太自負(fù)了。 五、表示未曾實(shí)現(xiàn)的選擇即表示過去本來可以有機(jī)會(huì)選擇做某事，但實(shí)際上沒有那樣做，通常譯為“本來可以”。如：Her husband could have told her, but he did not choose to. 她丈夫本來可以告訴她的，但他不想這樣做。I could have lent you the money. Wh

38、y didnt you ask me? 我本來可以借這筆錢給你的，你為什么不向我提出? you neednt have typed it twice. You could have used a carbon. 你沒必要打兩遍的，你當(dāng)時(shí)本可以用復(fù)寫紙打。You neednt have walked up; you could have taken the lift. 你沒必要走著上去，你本來可以乘電梯的。六、表示批評(píng)或責(zé)備即表示過去本來有責(zé)任或義務(wù)應(yīng)該做某事，但實(shí)際上卻沒有做成，含有批評(píng)和責(zé)備的意味，通常譯為“本來應(yīng)該”“本來可以”等。如：You could have started a li

39、ttle earlier. 你本可早點(diǎn)動(dòng)身的。You could have helped mewhy did you just sit and watch? 你本來可以幫我一把嘛為什么你只是坐在那兒觀望呢? I am disappointed that you didnt tell me. You could have told me. 你沒告訴我，我感到很失望，你本來應(yīng)該告訴我的。You could have let me know you were going out tonight. 你本來可以告訴我你今晚是要出去的七、表示達(dá)到極限表示即使人們盡力而為去做某事，但還是未能做成，通常用于否

40、定句。如：I couldnt have won, so I didnt go in for the race. 反正我也贏不了，所以我就沒有參加賽跑。I couldnt have enjoyed myself moreit was a perfect day. 我玩得沒法再痛快了這一天簡(jiǎn)直痛快極了。八、表示驚訝表示對(duì)所發(fā)生的情況感到驚奇，含有“竟然”的意味。如：It seems inconceivable that the accident could have happened so quickly. 這一事故發(fā)生得這么快，簡(jiǎn)直不可思議。Well, Im blowed! I should n

41、ever have thought you could have done it. 真想不到! 我從未想到居然辦得到。九、用于虛擬語氣在虛擬條件句中，當(dāng)談?wù)撨^去的情況時(shí)，其句型通常是：主句用“could / would / should /might+have+過去分詞”，從句用過去完成時(shí)。如：If I hadnt warned you, you could have been killed. 我如不是警告了你，你就可能喪命了。If you had come sooner, you could have helped us. 你如早來一點(diǎn)，就會(huì)幫上我們了。If he had known the

42、 facts, he could have told us what to do. 如果他了解事實(shí)，他是可能告訴我們?cè)鯓幼龅?。If anybody had asked me, I could have told them what happened. 如果有誰問過我，我可以告訴他們發(fā)生了什么情況。十、用于某些口語慣用表達(dá)可用于某些口語慣用表達(dá)，如用于I could have sworn，其意是“我可以發(fā)誓”“我千真萬確”。如：I could have sworn Id paid that bill. 我可以發(fā)誓我付過賬。 I could have sworn I heard a knock a

43、t the door. 我千真萬確聽到了敲門聲。l情態(tài)動(dòng)詞+have+done是重點(diǎn)和難點(diǎn)之一，現(xiàn)將其用法總結(jié)歸納如下： 一、 “must+have+done”表示對(duì)過去事情的肯定推測(cè)，譯成“一定做過某事”，該結(jié)構(gòu)只用于肯定句。1. It must have rained last night, for the ground is wet. 昨晚一定下雨了，因?yàn)榈孛孢€是濕的。2. You must have been mad to speak to the servant. 你和仆人說話，一定是發(fā)瘋了。二、 “cant+have+done”表示對(duì)過去事情的否定推測(cè)，譯成“不可能做過某事”。1.

44、 Mr. Smith cant have gone to Beijing, for I saw him in the library just now. 史密斯先生不可能去北京了，我剛才還在圖書館見過他。2. Mary cant have stolen your money. She has gone home. 瑪麗不可能偷你的錢，她回家去了。三、 “can+have+done”表示對(duì)過去行為的懷疑，用于疑問句，譯成“可能做過嗎？”。1. There is no light in the room. Can they have gone out? 屋里沒有燈，他們可能出去了嗎？2. There is nowhere to find them. Where can they have gone? 到處找不到他們，他們可能到什么地方去呢？四、 “could+have+done”是虛擬語氣，表示對(duì)過去事情的假設(shè)，意思是本來能夠做某事而沒有做。He could have passed the exam, but he was too careless. 本來他能夠通過考試，但是他太粗心。五、 “may+have+done”表示對(duì)發(fā)生過的事情的推測(cè)，意思是“可能已經(jīng)”或“也許已經(jīng)”，用于肯定句中。What has happened to George?I dont know.