高中英语主语从句全面讲解

1、（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.主语从句的连接词.连接词:that，whether.Thathewillwiniscertain.Whetherhelljoinusinthediscussionisofg

2、reatimportance.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，howoftenWhenwellstarttomorrowwillbetoldsoon.Wherewecanbuyoxenissomethingwe

3、needtofindout.Whyhecamehereisnotknown.Howwecanprotectthegrainfromdampneedstobediscussed.【连接词】thatThattheearthmovesaroundthesuniswellknown.whetherWhetherhewillcomeornotisnotknownyet.whoWhowillbesenttherehasnotbeendecided.whatWhatyouneedismorepractice.whichWhichoneisthebestisnotclear.when，whereWherehe

4、hasgoneisaquestion.why，howWhythereisgravityishardtounderstand.HowhecanearnalivinginBritainremainsabigproblem.whoever、whatever、whichever可引导主语从句。Whoevercomeswillbewelcome.Whateverhedidwasright.Whicheverofyoucomesinwillreceiveaprize.【小结】引导主语从句连词有that,whether,who,what,whateve等o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

5、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。为了防止句子头重脚轻，通常把形式主语t放在主语位置，真正主语后置。Itiscertainthathewillwinthematch.Itistruethathehasmadeaveryimportantdiscoveryinchemistry.Itisverylikelythattheywillholdameeting.Itisstrangethatthemanshouldhavestucktohissillyideas.Itisapitythatwewontbeabletogotothesouthtospendoursum

6、mervacation.Itisstillamysterywhatcausedtheaccident.ItissaidthathehasgonetoShanghai.Itseemsthathehasseenthefilm.【小结】1以that引出的主语从句,常以形式主语it引导，结构为：Itis+形容词/名词/某些动词ed+that从句。在有些that从句中要用虚拟语气(should+do/should+havedone)。用it作形式主语的结构Itis名词从句Itisafactthat事实是Itisanhonorthat.非常荣幸Itiscommonknowledgethat是常识Itis形

7、容词从句Itisnaturalthat.很自然Itisstrangethat.奇怪的是.It不及物动词从句Itseemsthat.似乎Ithappenedthat.碰巧Itappearsthat.似乎.Itbe+过去分词从句Itisreportedthat.据报道.Ithasbeenprovedthat.已证实.Itissaidthat.据说.“If作形式主语代替主语从句的常见句型举例Its+adj.+that/wh-clausee.g.Itsclear/natural/certainthatclauseItsobviousthatmoneydoesntgrowontrees.Its+p.p.

8、+that/wh-clausee.g.Itssaid/reported/knownthatclauseItsbelievedthathewillcomenextweek.Its+n.+that/wh-clausee.g.Itsashame/anhonour/goodnewsthatclauseItsstillaquestionwhenwellhaveourmeeting.It+v.(n./pron.)that/wh-clausee.g.Itmadeusveryhappythatshewaschosen.Itappearsthatheforgottosigntheletter.whether与i

9、f均为是否”，但下列情况下只用whether:引导主语从句并在句首Whetherhewillcomeisnotclear.引导表语从句Thequestioniswhetherhellcome.whether从句作介词宾语Imnotsureaboutwhetherwellwin.引导让步状语从句时Whetheryoulikeitornot,youllhavetodoit.【注意事项】主语从句位于句首时必须由连接词引导。主语从句后置时引导词that可省略。主语从句位于句首时，不能用if引导。主语从句后置时,可以用if引导。练一练Whatmakesthisshopdifferentisthatito

10、ffersmorepersonalservices.ThesewildflowersaresospecialIwoulddowhateverIcantosavethem.Itisrequiredintheregulationsthatyoushouldnottellpeoplethepassportofyoure-mailaccount.Itisprettywellunderstoodwhatcontrolstheflowofcarbondioxideinandoutoftheatmospheretoday.Whatmadetheschoolproudwasthatmorethan90%oft

11、hestudentshadbeenadmittedtokeyuniversities.Itnowappearsthattheyareinneedofhelp.Whoeverknowsthetruthwilltellyouaboutit.Itisgoodnewsthattheywillarriveinafewdays.Usethewordsbelowtofillintheblankswatchwaslostisunknown.youdidisright.wewillgoforanoutingtomorrowremainsunknown.weneedistime.willbeourmonitorh

12、asntbeendecidedyet.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.Whowillbeourmonitorhasntbeendecidedyet.Whosewatchwaslostisunknown.Whateveryou

13、didisright.Whetherwewillgoforanoutingtomorrowremainsunknown.Whatweneedistime.Whowillbeourmonitorhasntbeendecidedyet.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。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.Whowillwinthematchisstillunkno

14、wn.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。Itisapitythat

15、shehasmadesuchamistake.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。Whetherhellcomehereisntclear.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。Whate

16、verhesaysisofnoimportance无论谁说这话都不对。WhoeversaysthatiswrongHowthishappenedisnotcleartoanyone.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。youdontlikehimisnoneofmybusiness.hesaidatthemeetingastonishedeverybodypresent.the2000OlympicGameswillbeheldinBeijingisnotknownyet.wellgocampingtomorrowdependsontheweather.leavestheroomlastoughttoturnoffthelights.ThatWhatWhetherWhetherWhoever填空。_is