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MadebyShiGuohua名词性从句一、引导名词性从句的连接词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。Thatshewaschosenmadeusveryhappy.Weheardthenewsthatourteamhadwon.whether与if均为“是否”的意思。但在下列情况下，whether不能被if所取代：1.whether引导主语从句（包括从句在句首的位置）应当用whether，不用if，如：Whetheritistrueremainsaproblem.Whetherhewillcome,Iamnotsure.2.引导表语从句用whether，不用if，如：Thequestioniswhetheryoushouldacceptit.3.whether可以引导从句作介词的宾语，而if则不能，如：I’mnotinterestedinwhetherthey’llgoornot.Itdependsonwhetherwehavegotenoughmoney.4.whether可以直接跟动词不定式连用，而if则不能，如：Ididn’tknowwhethertolaughortocry.Shehasn’tdecidedwhethertogoornot.5.引导同位语从句用whether，不用if，如：Thequestionwhetherhe’llattendthemeetingisessential.★大部分连接词引导的主语从句都可置于句末，用it充当形式主语。Itisnotimportantwhowillgo.二、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.宾语：JohnsaidthathewasleavingforLondononWednesday.表语：Thefactisthathehasnotbeenseenrecently.同位语：Thefactthathehasnotbeenseenrecentlydisturbseveryoneinhisoffice.形容词宾语：Iamgladthatyouaresatisfiedwithyourjob.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.It'sapitythatyoushouldhavetoleave.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……用it作形式主语的that-从句有以下四种不同的搭配关系：三、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.直接宾语：Inone'sownhomeonecandowhatonelikes.间接宾语：Theclubwillgivewhoeverwinsaprize.表语：Myquestioniswhowilltakeoverthepresident.宾语补足语：Shewillnamehimwhatevershewantsto.同位语：Ihavenoideawhenhewillreturn.形容词宾语：I'mnotsurewhysherefusedtheirinvitation.介词宾语：Thatdependsonwhereweshallgo.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.四、if,whether引导的名词从句1）yes-no型疑问从句从属连词if,whether引导的名词从句是由一般疑问句或选择疑问转化而来的，因此也分别被称为yes-no型疑问句从句和选择型疑问从句，其功能和wh-从句的功能相同，例如：主语：Whethertheplanisfeasibleremainstobeproved.宾语：Letusknowwhether/ifyoucanfinishthearticlebeforeFriday.表语：Thepointiswhetherweshouldlendhimthemoney.同位语：Theyareinvestigatingthequestionwhetherthemanistrustworthy.形容词宾语：She'sdoubtfulwhetherweshallbeabletocome.介词宾语：Iworryaboutwhetherhecanpasstheexams.2）选择性疑问从句选择性疑问从句由关联词if/whether…or或whethe…ornot构成,如：Pleasetellmewhether/iftheyareSwedishorDanish.Idon'tcarewhetheryouliketheplanornot.五、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.Itdoesn'tappearthatwe'llhaveasunnydaytomorrow.3)有时将动名词，介词短语或整个从句的否定转变为对谓语动词的否定。Idon'trememberhavingeverseensuchaman.我记得从未见过这样一个人。(not否定动名词短语having…)4)有时状语或状语从句中否定可以转移到谓语动词前。Theantisnotgatheringthisforitselfalone.(否定状语)1.Itnowappears______theyareinneedofhelp.A.thatB.whichC.whatD.how2.Itisgoodnews______theywillarriveinafewdays.A.whichB.whatC.thatD.how3.It______Joedrivesbadly.A.thoughtthatB.thinksthatC.isthoughtthatD.isthoughtthat4.It______heislateforclass.A.maythatB.mightthatC.maybethatD.mightbewhat5.Thisis______shewasborn.A.whereB.whichC.thatD.what6.Thequestionis______wecan’tgotheretoday.A.thatB.whatC.whichD.when7.Thequestionis______itisworthdoing.A.ifB.whetherC.whichD.what8.Thereasonhehasmadesuchgreatprogressis_______hehasneverwastedhistime.A.becauseB.whyC.thatD.what9.Mysuggestionis______weshouldturnthelandintoricefields.A.whatB.thatC.whichD.where10.Hisproposalisthatthedam______atthefootofthemountain.A.buildB.willbuildC.bebuiltD.willbebuilt11.Myadviceisthathe______regularhouse.A.keepB.wouldkeepC.keepsD.kept12.______knowsthetruthwilltellyouaboutit.A.WhothatB.WhoeverC.WhomthatD.Thatwho13.Weallknowthetruth_____theearthgoesroundthesun.A.thatB.whichC.whatD.whether14.Weheardthenews______ourteamhadwon.A.whichB.thatC.whatD.where15.Theproblem______itisrightorwronghasnotyetbeendecided.A.whichB.thatC.whetherD.if16.Youmustdowell______theteacherasksyoutodo.A.whichB.whatC.thatD.whereGood-bye!