主语从句定义

1、主语从何定义：在句子中担当主语的是一个从句,这个从何就叫做主语从何.主语从句是在复合句中充当主语的从何,通常放在主句谓语动词之前或由形式主语it代替,而本身放在句子末尾.主语从句主要有三类：(1)由连词that引导的主语从句：引导词that无含义,在句中不做成分,不可以省.Thatyouwillwinthemedalseemsunlikely.Thatyouaresoindifferentbothersme.Thatshesurvivedtheaccidentisamiracle.(2)用连词whether引导的主语从句：whether有含义(是否),在句中不做成分,不可以省.Whethers

2、heiscomingornotdoesn'tmattertoomuch.(3)用连接代词引导的主语从句(在由连接代词who,whose,whom,which,what,whoever,whomever,whichever,whatever引导的名词性从句中,其连接代词在句中起名词性作用,担当一定成分).Whatyouneedismorepractice.WhatIwanttoknowisthis.Whateverwedoistoservethepeople.(4)用连接副词when,where,why,how引导的名词性从何(其连接副词有含义,在句中作状语.)eg:Wherewesho

3、uldleaveitisaproblem.Whentheywillcomehasn'tbeenmadepubic.ATTENTION做形式主语,而将主语从何放在旬末(尤其是当谓语较短时).例如：Thatlighttravelsinstraightlinesisknowntoall.=Itisknowntoallthatlighttravelsinstraightlines.Whentheplaneistotakeoffhasnotbeenannounced.=Ithasnotbeenannouncedwhentheplaneistotakeoff.(当what引导的主语从何表示“的东西

4、时,一般不用it作形式主语.)Whathewantsisabook.他想要的是本书.Hasitbeensettledwhowillbesenttocarryoutthetask固定用法和译法(1) Itis+名词+从旬Itisafactthat事实是Itisgoodnewsthat是好消息Itisaquestionthat是个问题Itiscommonknowledgethat是常识类彳以的名词还有：apity;awonder；agoodthing；nowonder；surprise等.例如：Itisamysterytomehowitallhappened.Itiscommonknowledge

5、thatthewhaleisnotafish.ItisnosurprisethatBobshouldhavewonthegame.(2) Itis+形容词+从句Itisnecessarythat有必要Itisclearthat很清楚Itislikelythat很可能Itisimportantthat重要的是类彳以的形容词还有：strange;natural;obvious;true;good;wonderful;possible;unlikely;quite;unusual;certain;evident;worth-while;surprising;interesting;astonishi

6、ng,etc.Itisobviousthatconductorsandinsulatorsarebothimportantinindustry.Itisdoubtfulwhethershewillbeabletocome.Itwasreallyastonishingthatherefusedtotalktoyou.Itisessentialthatheshouldbeherebytheweekend.Itseemsobviousthatwecannotgoonlikethis.(3) Itis+过去分词+从句Itissaidthat据说Itisreportedthat据报道Ithasbeenp

7、rovedthat已证实Itmustbeprovedthat必须指出类彳以的过去分词还有：known;estimated;expected;believed;thought;hoped;noted;discussed;required;decided;suggested;demanded;madeclear;foundout,etc.Itisthoughtthatheisthebestplayer.Itisestimatedthatthevaseis2000yearsold.Itisusedtobethoughtthatanewstarmustbeduetoacollisionbetweent

8、wostars.Ithasnotbeenmadeclearwhenthenewroadistobeopenedtotraffic.ItdoesnotmatterifImissedmytrain,becausethereisanotherlater.IthappenedthatIsawhimyesterday.当及物动词+宾语较短时,也可用这种结构.ItshockedmethatPeterdidnottellanybodywherehewas.Itdoesnotinterestmewhetheryougoornot.2.只用whether不用if引导主语从句.主语从句三要点请观察以下句子,注意划

9、线局部句子的意义及用法.1. Whatsurprisedmemostwasthatthelittlegirlcouldplaytheviolinsowell.2. Whowillgototheconcertisnotknown.3. Thatshewaschosenmadeusveryhappy.4. Whethershewillcomeornotisstillaquestion.5. Whichbooktheywillchooseisstillunknown.6. Whenweshallholdoursportsmeetisnotdecided.7. Itsstrangethatheknow

10、snothingaboutit.8. Itisapitythatshehasmadesuchamistake.9. ItissaidthatPresidentJingowillvisitourschoolnextweek.小结归纳一语序主语从何使用陈述语序,其通常结构为引导词+主语+谓语+其他成分；但当连接代词同时充当从旬主语时,其结构为连接代词+谓语+其他成分,如旬1、2.二引导词that引导主语从何时无词义,也不充当任何成分,但通常不可以省略,如何3;whether引导主语从何时意为是否,通常不能用if来代替,如何4； 可以引导主语从句的连接代词主要有：who,whom,whose,wha

11、t,which,whatever,whoever等,如旬5; 可以引导主语从句的连接副词主要有：where,when,how,why等,如何6.三常见句型有时为防止句子头重脚轻,常用it作形式主语,代替主语从何放在旬首,而把主语从旬置于旬末.常用句型如下：It+be+形容词+that从旬,如旬7;It+be+名词+that从旬,如旬8;It+be+动词的过去分词+that从旬,如何9.即学即用I.用适当的词填空,使句子意思完整.1 .hedidn'tattendthemeetingyesterdaywasn'tquiteclear.2 .TheForeignMinistersa

12、id,“Itisourhopethetwosideswillworktowards“peace.3 .teamwillwinthematchisstillunknown.4 estothepartywillreceiveapresent.5 .Maryhasleftisstillaquestion.6 .Itsreportedthreepeoplewerekilledintheaccidentandfivewerehurtbadly.7 .hesolvedtheproblemsuccessfullyinterestedallofus.8 .Weusuallythinkwecan'tge

13、tseemsbetterthanwhatwehave.9 .ItisafactEnglishisbeingacceptedasaninternationallanguage.10 .istobesenttheretosolvetheproblemhasnd.'tbeendecideII.以下各句中均有一处错误,请改正.1. Thattheoldmanssonwantedtoknowwaswherethegoldhadbeenhidden.2. ItisreportedwhenChinahassuccessfullysentShenzhouVIspaceshipintospace.3.

14、Ifhecanfinishhistaskontimeisofgreatimportance.4. Whetherthe2021OlympicGameswillbeheldinBeijingexcitedthewholenation.5. AfterYangLiweisucceededincirclingtheearth,whichourastronautsdesiretodoiswalkinspace.6. Whateverleavestheroomlastoughttoturnoffthelights.7. Whytheywillsolvetheseriousproblemtodayhasn

15、otbeendecided.8. WhenwillwintheEnglishcompetitionisstillaproblem.9. Howourspringsportsmeetwillbeheldornotthisweekisnotknownyet.10. ItsstrangewhenheshouldhavegoneawaywitetUurtgtus.主语从何学习指导寻规找矩请观察以下句子,注意主语从句的用法.1. Thattheearthtravelsroundthesunisawell-knownfact.2. Itisuncertainwhethertheartistcandoito

16、rnot.3. Whowillacttheleadintheplayhasnotbeendecidedyet.4. Wheretheyoungmanhasgoneisnotknown.5. Itisnotyetdecidedwhenandwherethetestwillbegiven.归纳总结1 .引导主语从何的词有连词that,whether；连接代词who,whose,whom,whoever,what,which等；连接副词where,when,whenever,wherever,how,why等.2.有时用it作形式主语,将主语从句后置常见错误展示以下各句均有一处错误,请改正并分析错误

17、的原因.1. Lighttravelsfasterthansoundiscommonknowledge.2. Ifshe'scomingornotdoesn'tmattermuch.3. Thattheprofessorsaidisofgreatimportance.4. Wherewillthetreesbeplantedhasnotbeendecided.5. Nomatterwhobreakstherulewillbepunished.6. Whenandwherethemeetingwillbeheldstillremainaquestion.7. Whatwereyo

18、urproblemsayearagohasnowbecomemine.8. Itwasrequestedthateveryonemadeaspeechatthemeeting.高考链接从A、B、CD四个选项中选出可以填入空白处的最正确选项.1 .wantstostayinahotelhastopaytheirownway.浙江2021A.AnyoneB.TheoneC.WhoeverD.Who2 .mattersmostinlearningEnglishisenoughpractice.2007全国卷HA.WhatB.WhyC.WhereD.Which3 .fashiondiffersfrom

19、countrytocountrymayreflecttheculturaldifferencesfromoneaspect.±海2002春A.WhatB.ThatC.ThisD.Which4 .we'llgocampingtomorrowdependsontheweather.NMET1996A.IfB.WhetherC.ThatD.Where主语从句练习单项选择题1 .asmuchasone-fifthofalltimberharvestedisnotused.A.TheestimateB.TheestimateC.TheyareestimatedD.Itisestimat

20、edthat2 .wasonceregardedasimpossiblehasnowbecomeareality.A.ThatB.WhichC.WhoD.What3 .wehaveachievedisattributedtotheguidanceofourparents.A.WhoeverB.WhateverC.HoweverD.That4 .yousaynowcan'tmakeupforwhatyou愉vedone.A.NomatterB.WhateverC.HoweverD.That5. Althoughhappenedinthisdevelopedcountrysoundslik

21、esciencefiction,itcouldoccurelsewhereintheworld.A.whichB.whatC.howD.it6.shehadforgottentotakehernotebook.A.ThatoccurredtoherB.SheoccurredthatC.ToherthatoccurredD.Itoccurredtoherthat7. Iamsurethatshesaidiswrong.A.whichB.allC.thisD.what8. Welostourwayintheforest,andmademattersworsewasthatitwasgettingd

22、ark.A.thatB.whichC.itD.what9.occurredtohimthathehadforgottentolockthedoorwhenhelefthome.A.ThisB.ItC.ThatD.These10.ornotisstilluncertain.A.He'comingB.IfheiscomingC.ThatcomingD.Whethehie'coming11. It'she'beabletocome.A.doubtwhetherB.doubtfulC.doubtitD.doubtfulwhether12. Itisthatthebrid

23、gehasexistedformorethanthreecenturies.A.appearedB.risenC.saidD.born13. hesawbothsurprisedandfrightenedhim.A.ThatB.WhenC.WhatD.Which14.isaspellofwarmsunshine.A.Whatdoweallneed.B.WhatallweneedC.WhatweneedD.Whatweallneed15.isapitythatheshouldfeelsoupset.A.WhatB.ThatC.HeD.It16.aspoonfulofsoilcantellusso

24、muchaboutthestructureandearlyhistoryofthemoon.A.RemarkableB.QuiteremarkablyC.ItisremarkablethatD.Itisremarkable17 .younominatewillbeelected.A.WhoB.WhichC.WhomeverD.That's18 .bookyouborrowmustbereturnedwithinaweek.A.WhatB.WhichC.WhicheverThat's19 .istroublingmeisthatIdonthavemuchexperienceini

25、nternationalcommerce.A.ItB.ThatC.WhichD.What20 .theywilgotheretotryanotherexperimenthasnotbeendecidedyet.A.WhetherB.IfC.AboutwhetherD.Why根据提示,完成句子.hasn'tbeendecidedyet.(pick)谁将去接他还没有确定.remainsunknown.(finish)我们是否能按时完成工作还不知道isnoneofmybusiness.(like)你喜不喜欢他都与我无关.isbeingdiscussed.(abroad)他将何时出国正在讨论之

26、中.inlearningEnglishisenoughpractice.(matter)英语学习中最重要的是足够的练习.worriedherabit.(turn)她的头发正在变白让她有些担忧.YangLiweisucceededincirclingtheearth,ourastronautswalkinspace.(desire)杨利伟成功地环绕地球后,我们希望的是宇航员在太空漫步.8.shouldbepunished.(break)任何违法的人都应该被惩罚.wecanlearnfourforeignlanguagesatthesametime.(seem)我们能同时学四门外语似乎不可能.wasthatmorethan90%ofthestudentshadbeenadmittedtothekeyuniversities.让这所学校感到自豪的是超过90%的学生被重点大学录取了.主语从句15DDBBB610DDDBD1115DCCDD1620CACDAwillpickhimupwecanfinishtheworkontimeyoulikehim(ornot)h