大学英语三级语法大全名词性从句概述名词性从句在句子中起名词作用的句子叫名词从句(NounClauses)。名词从句的功能相当于名词词组,它在复合句中能担任主语、宾语、表语、同位语、介词宾语等,因此根据它在句中不同的语法功能,名词从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。引导名词性从句的连接词引导名词性从句的连接词引导名词性从句的连接词可分为三类:连接词:that,whether,if(不充当从句的任何成分)连接代词:what,whatever,who,whoever,whom,whose,which.连接副词:when,where,how,why不可省略的连词:1.介词后的连词2.引导主语从句和同位语从句的连词不可省略。Whatshewaschosenmadeusveryhappy.Weheardthenewsthatourteamhadwon.比较:whether与if均为是否的意思。但在下列情况下,whether不能被if取代:1.whether引导主语从句并在句首2.引导表语从句3.whether从句作介词宾语4.从句后有ornotWhetherhewillcomeisnotclear.大部分连接词引导的主语从句都可以置于句末,用it充当形式主语。Itisnotimportantwhowillgo.Itisstillunknownwhichteamwillwinthematch.名词性wh-从句名词性wh-从句1)由wh-词引导的名词从句叫做名词性wh-从句。Wh-词包括who,whom,.whose,whoever,what,whatever,which,whichever等连接代词和where,when,how,why等连接副词。Wh-从句的语法功能除了和that-从句一样外,还可充当介词宾语、宾语补语和间接宾语等,例如:主语:Howthebookwillselldependsonitsauthor.书销售如何取决于作者本人。直接宾语:Inone'sownhomeonecandowhatonelikes.在自己家里可以随心所欲。间接宾语:Theclubwillgivewhoeverwinsaprize.俱乐部将给得胜者设奖。表语:MyquestioniswhowilltakeoverpresidentoftheFoundation.我的问题是谁将接任该基金会主席职位。宾语补足语:Shewillnamehimwhatevershewantsto.她高兴给他起什么名字就取什么名字。同位语:Ihavenoideawhenhewillreturn.我不知道他什么时候回来。形容词宾语:I'mnotsurewhysherefusedtheirinvitation.我尚不能肯定她为什么拒绝他们的邀请。介词宾语:Thatdependsonwhereweshallgo.那取决于我们去哪儿。2)Wh-从句作主语也常用先行词it做形式主语,而将wh-从句置于句末,例如:Itisnotyetdecidedwhowilldothatjob.还没决定谁做这项工作。Itremainsunknownwhentheyaregoingtogetmarried.他们何时结婚依然不明。名词性that-从句名词性that-从句1)由从属连词that引导的从句叫做名词性that-从句。that只起连接主句和从句的作用,在从句中不担任任何成分,本身也没有词义。名词性that-从句在句中能充当主语、宾语、表语、同位语和形容词宾语,例如:主语:Thatheisstillaliveissheerluck.他还活着全靠运气。宾语:JohnsaidthathewasleavingforLondononWednesday.约翰说他星期三要到伦敦去。表语:Thefactisthathehasnotbeenseenrecently.事实是近来谁也没有见过他。同位语:Thefactthathehasnotbeenseenrecentlydisturbseveryoneinhisoffice.近来谁也没有见过他,这一事实令办公室所有的人不安。形容词宾语:Iamgladthatyouaresatisfiedwithyourjob.你对工作满意我感到很高兴。2)That-从句作主语通常用it作先行词,而将that-从句置于句末,例如:Itisquiteclearthatthewholeprojectisdoomedtofailure.很清楚,整个计划注定要失败。It'sapitythatyoushouldhavetoleave.你非走不可真是件憾事。用it作形式主语的that-从句有以下四种不同的搭配关系:a.It+be+形容词+that-从句Itisnecessarythat…有必要……Itisimportantthat…重要的是……Itisobviousthat…很明显……b.It+be+-ed分词+that-从句Itisbelievedthat…人们相信……Itisknowntoallthat…从所周知……Ithasbeendecidedthat…已决定……c.It+be+名词+that-从句Itiscommonknowledgethat………是常识Itisasurprisethat…令人惊奇的是……Itisafactthat…事实是……d.It+不及物动词+that-分句Itappearsthat…似乎……Ithappensthat…碰巧……Itoccurredtomethat…我突然想起……否定转移1)将think,believe,suppose,expect,fancy,imagine等动词后面宾语从句的否定词转移到主句中,即主句的谓语动词用否定式,而从句的谓语动词用肯定式。Idon'tthinkIknowyou.我想我并不认识你。Idon'tbelievehewillcome.我相信他不回来。注意:若谓语动词为hope,宾语从句中的否定词不能转移。Ihopeyouweren'till.我想你没有生病吧。2)将seem,appear等后的从句的否定转移到前面。Itdoesn'tseemthattheyknowwheretogo.看来他们不知道往哪去。Itdoesn'tappearthatwe'llhaveasunnydaytomorrow.看来我们明天不会碰上好天气。定语从句定语从句(AttributiveClauses)在句中做定语,修饰一个名词或代词,被修饰的名词,词组或代词即先行词。定语从句通常出现在先行词之后,由关系词(关系代词或关系副词)引出。关系代词有:who,whom,whose,that,which等。关系副词有:when,where,why等。关系代词引导的定语从句关系代词引导的定语从句关系代词所代替的先行词是人或物的名词或代词,并在句中充当主语、宾语、定语等成分。关系代词在定语从句中作主语时,从句谓语动词的人称和数要和先行词保持一致。1)who,whom,that这些词代替的先行词是人的名词或代词,在从句中所起作用如下:Ishethemanwho/thatwantstoseeyou?他就是你想见的人吗?(who/that在从句中作主语)Heisthemanwhom/thatIsawyesterday.他就是我昨天见的那个人。(whom/that在从句中作宾语)2)Whose用来指人或物,(只用作定语,若指物,它还可以同ofwhich互换),例如:Theyrushedovertohelpthemanwhosecarhadbrokendown.那人车坏了,大家都跑过去帮忙。Pleasepassmethebookwhose(ofwhich)coverisgreen.请递给我那本绿皮的书。3)which,that它们所代替的先行词是事物的名词或代词,在从句中可作主语、宾语等,例如:Aprosperitywhich/thathadneverbeenseenbeforeappearsinthecountryside.农村出现了前所未有的繁荣。(which/that在句中作宾语)Thepackage(which/that)youarecarryingisabouttocomeunwrapped.你拿的包快散了。(which/that在句中作宾语)关系副词引导的定语从句关系副词引导的定语从句关系副词可代替的先行词是时间、地点或理由的名词,在从句中作状语。1)when,where,why关系副词when,where,why的含义相当于介词+which结构,因此常常和介词+which结构交替使用,例如:Thereareoccasionswhen(onwhich)onemustyield.任何人都有不得不屈服的时候。Beijingistheplacewhere(inwhich)Iwasborn.北京是我的出生地。Isthisthereasonwhy(forwhich)herefusedouroffers?这就是他拒绝我们帮助他的理由吗?2)that代替关系副词that可以用于表示时间、地点、方式、理由的名词后取代when,where,why和介词+which引导的定语从句,在口语中that常被省略,例如:Hisfatherdiedtheyear(that/when/inwhich)hewasborn.他父亲在他出生那年逝世了。Heisunlikelytofindtheplace(that/where/inwhich)helivedfortyyearsago.他不大可能找到他四十年前居住过的地方。判断关系代词与关系副词判断关系代词与关系副词方法一:用关系代词,还是关系副词完全取决于从句中的谓语动词。及物动词后面无宾语,就必须要求用关系代词;而不及物动词则要求用关系副词。例如:ThisisthemountainvillagewhereIstayedlastyear.I'llneverforgetthedayswhenIworkedtogetherwithyou.判断改错(错)ThisisthemountainvillagewhereIvisitedlastyear.(对)Thisisthemountainvillage(which)Ivisitedlastyear.(错)IwillneverforgetthedayswhenIspentinthecountryside.(对)I'llneverforgetthedays(which)Ispentinthecountryside.习惯上总把表地点或时间的名词与关系副词where,when联系在一起。此两题错在关系词的误用上。方法二:准确判断先行词在定语从句中的成分(主、谓、宾、定、状),也能正确选择出关系代词/关系副词。例1.Isthismuseum___youvisitedafewdaysage?A.whereB.thatC.onwhichD.theone例2.Isthisthemuseum____theexhibitionwasheld.A.whereB.thatC.onwhichD.theone答案:例1D,例2A例1变为肯定句:Thismuseumis___youvisitedafewdaysago.例2变为肯定句:Thisisthemuseum___theexhibitionwasheld.在句1中,所缺部分为宾语,而where,that,onwhich都不能起到宾语的作用,只有theone既做了主句的表语,又可做从句的宾语,可以省略关系代词,所以应选D。而句2中,主、谓、宾俱全,从句部分为句子的状语表地点,既可用副词where,又因inthemuseum词组,可用介词in+which引导地点状语。而此题中,介词on用的不对,所以选A。关系词的选择依据在从句中所做的成分,先行词在从句中做主、定、宾语时,选择关系代词(who,whom,that,which,whose);先行词在从句中做状语