完整高中英语主语从句全面讲解

语法Nounclausesasthesubject主语从句如果一个句子在复合句中充当一个主语,那么这个句子就是主语从句。Thathefinishedwritingthecompositioninsuchashorttimesurprisedusall.Whatweneedaregooddoctors.Whomwemuststudyforisaquestionofgreatimportance.1.主语从句的连接词1).连接词:that,whether.Thathewillwiniscertain..Whetherhe'lljoinusinthediscussionisofgreatimportance..连接代词：who,what,which,whom,whose,whoever,whatever,whichever.Itisclearwhoisafraidofhavingachangeinlandownership..WhatIndianeedsisalawtomakelandownershipfairer..连接副词：when,where,why,how,howmany,howmuch,howlong,howsoon,howoftenWhenwe'llstarttomorrowwillbetoldsoon.Wherewecanbuyoxenissomethingweneedtofindout.Whyhecamehereisnotknown.Howwecanprotectthegrainfromdampneedstobediscussed.【连接词】that——Thattheearthmovesaroundthesuniswellknown.whetherWhetherhewillcomeornotisnotknownyet.whoWhowillbesenttherehasnotbeendecided.whatWhatyouneedismorepractice.whichWhichoneisthebestisnotclear.when,whereWherehehasgoneisaquestion.why,howWhythereisgravityishardtounderstand.HowhecanearnalivinginBritainremainsabigproblem.whoever、whatever、whichever可引导主语从句。Whoevercomeswillbewelcome.Whateverhedidwasright.WhicheverofyouWhoevercomeswillbewelcome.【小结】引导主语从句连词有that,whether,who,what,whatever等。连词位于句首不能省略。主语从句大多数情况下视为第三人称单数，但在连接代词what引导的主语从句后谓语动词的数要根据句意而定。it放在主语位置，真正主语后置。★为了防止句子头重脚轻，通常把形式主语一Itiscertainthathewillwinthematch.Itistruethathehasmadeaveryimportantdiscoveryinchemistry.Itisverylikelythattheywillholdameeting.Itisstrangethatthemanshouldhavestucktohissillyideas.Itisapitythatwewon'tbeabletogotothesouthtospendoursummervacation.Itisstillamysterywhatcausedtheaccident.hehasgonetoShanghai.7.Itissaidthathehasseenthefilm.&Itseemsthat【小结】。ed+that形容词/名词/某些动词从句1.以that引出的主语从句，常以形式主语it引导，结构为：Itis+。从句中要用虚拟语气(should+do/should+havedone)2.在有些that作形式主语的结构★用it从句＋名词＋(1)Itis事实是…Itisafactthat……非常荣幸Itisanhonorthat…是常识Itiscommonknowledgethat从句＋形容词＋(2)Itis很自然…Itisnaturalthat…奇怪的是…Itisstrangethat…从句不及物动词＋(3)It＋似乎……Itseemsthat碰巧…Ithappenedthat…似乎…Itappearsthat…从句＋(4)It＋be+过去分词据报道…Itisreportedthat…已证实…Ithasbeenprovedthat…据说…Itissaidthat…作形式主语代替主语从句的常见句型举例★“It”-clause①It's+adj.+that/whclausethatIt'sclear/natural/certaine.g.It'sobviousthatmoneydoesn'tgrowontrees.+p.p.+that/wh-clauseIt's②It'ssaid/reported/knownthatclausee.g.It'sbelievedthathewillcomenextweek.-clauseIt's+n.+that/wh③e.g.It'sashame/anhonour/goodnewsthatclauseIt'sstillaquestionwhenwe'llhaveourmeeting.④It+v.(n./pron.)that/wh-clausee.g.Itmadeusveryhappythatshewaschosen.Itappearsthatheforgottosigntheletter.★whether与if均为“是否”但下列情况下只用whether:弓丨导主语从句并在句首Whetherhewillcomeisnotclear.弓丨导表语从句Thequestioniswhetherhe'llcome.whether从句作介词宾语I'mnotsureaboutwhetherwe'llwin.弓导让步状语从句时——Whetheryoulikeitornot,you'llhavetodoit.【注意事项】弓导。句首时必须由连接词主语从句位于1.主语从句后置时弓导词that可省略。主语从句位于句首时,不能用if弓导。主语从句后置时,可以用if弓导。A**练一练Whatmakesthisshopdifferentisthatitoffersmorepersonalservices.ThesewildflowersaresospecialIwoulddowhateverIcantosavethem.Itisrequiredintheregulationsthatyoushouldnottellpeoplethepassportofyoure-mailaccount.Itisprettywellunderstoodwhatcontrolstheflowofcarbondioxideinandoutoftheatmospheretoday.Whatmadetheschoolproudwasthatmorethan90%ofthestudentshadbeenadmittedtokeyuniversities.Itnowappearsthattheyareinneedofhelp.Whoeverknowsthetruthwilltellyouaboutit.&Itisgoodnewsthattheywillarriveinafewdays.Usethewordsbelowtofillintheblankswatchwaslostisunknown.youdidisright.wewillgoforanoutingtomorrowremainsunknown.weneedistime.willbeourmonitorhasn'tbeendecidedyet.whetherwhatwhowhosewhateverWhetherWhatWhateverWhoseWho上面的空大家都填对了吗?上面每个句子都出现了的主语从句，大家能找到吗？Whosewatchwaslostisunknown.Whateveryoudidisright.Whetherwewillgoforanoutingtomorrowremainsunknown.Whatweneedistime.Whowillbeourmonitorhasn'tbeendecidedyet.Whosewatchwaslostisunknown.Whateveryoudidisright.Whetherwewillgoforanoutingtomorrowremainsunknown.Whatweneedistime.Whowillbeourmonitorhasn'tbeendecidedyet.在有些that从句中要用虚拟语气(should+do/should+havedone)。他出生在何地还不知道。2.谁会赢得比赛还不知道。谁来都欢迎。那个人为什么被谋杀尚不知道。Wherehewasbornhasnotbeenfound.Whythepersonwasmurderedisstillunknown.Whowillwinthematchisstillunknown.Whoevercomesiswelcome.Whattheteachersaidtodaywasquiteright.老师今天说的话是十分正确的。Thattheyarebadlyinneedofhelpisquiteclear.他们急需帮助，这是十分明显的。Whethertheywillsellthehouseisnotyetdecided.他们是否卖掉这所房子还没有决定。Whateverwassaidheremustbekeptsecret.这里说的话都应当保密。Whoevermakesmistakesmustcorrectthem.凡犯了错误的人都必须改正。Itisapitythatshehasmadesuchamistake.她犯了这样一个错误,真是遗憾。Itisbelievedthatatleastascoreofbuildingsweredamagedordestroyed.据信,至少有二十座楼房遭到破坏或彻底毁掉。Thattheyweretruesisterswasclearfromthefacialresemblancebetweenthem.很明显，她们确是亲姐妹，她们的脸型很相似。Whetherhe'llcomehereisn'tclear.他是否会来这里还不清楚。Whatshedidisnotyetknown.她干了什么尚不清楚。无论他说什么都不重要。Whateverhesaysisofnoimportance无论谁说这话都不对。Whoeversaysthatiswrong．Howthishappenedisnotcleartoanyone.这事怎样发生的，谁也不清楚。Whoevercomesiswelcome.不论谁来都欢迎。不管是谁犯了法，他都应该受到惩罚。Whoeverbreaksthelawshouldbepunished。1.youdon'tlikehimisnoneofmybusiness.2.hesaidatthemeetingastonishedeverybodypresent.3.the2000OlympicGameswillbeheldinBeijingisnotknownyet.we'llgocampingtomorrowdependsontheweather.leavestheroomlastoughttoturnoffthelights.ThatWhatWhetherWhetherWhoever填空。_