主語從句詳解及練習-附答案

1、語法要點剖析一、名詞性從句主語從句、表語從句、賓語從句、同位語從句，在整個句子中所起的作用，相當于一個名詞。因此，這四種從句通稱為名詞性從句。引導名詞性從句的連接詞可分為三類：連接詞：that,whether,if（不充當從句的任何成分）連接代詞：what,whatever,who,whoever,whom,whose,which.連接副詞：when,where,how,why1.主語從句作句子主語的從句叫主語從句。主語從句通常由從屬連詞that，whether，if和連接代詞what，who，which，whatever，whoever以及連接副詞how，when，where，why等詞引導

2、。that在句中無詞義，只起連接作用；連接代詞和連接副詞在句中既保留自己的疑問含義、又起連接作用，在從句中充當從句的成分。例如：whathewantstotellusisnotclear.他要跟我們說什么，還不清楚。itisknowntoushowhebecameawriter.我們都知道他是如何成為一名作家的。wheretheenglisheveningwillbeheldhasnotyetbeenannounced.英語晚會將在哪里舉行，還沒有宣布。有時為避免句子頭重腳輕，常用形式主語it代替主語從句作形式主語放于句首，而把主語從句置于句末。主語從句后的謂語動詞一般用單數形式。常用句型如下

3、：（1）it+be+名詞+that從句（2）it+be+形容詞+that從句（3）it+be+動詞的過去分詞+that從句（4）it+不及物動詞+that從句另注意在主語從句中用來表示驚奇、不相信、惋惜、理應如此等語氣時，謂語動詞要用虛擬語氣“(should)+do”，常用的句型有：itisnecessary(important,natural,strange,etc.)thatitisapity(ashame,nowonder,etc.)thatitissuggested(requested,proposed,desired,etc.)that2.賓語從句名詞句用作賓語的從句叫賓語從句。引導

4、賓語從句的關聯詞與引導主語從句表語從句的關聯詞大致一樣，在句中可以作謂語動詞或介詞及非謂語動詞的賓語。1.由連接詞that引導的賓語從句由連接詞that引導賓語從句時，that在句中不擔任任何成分，在口語或非正式的文體中常被省去，但如從句是并列句時,第二個分句前的that不可省。例如：hehastoldmethathewillgotoshanghaitomorrow.他已經告訴我他明天要去上海。wemustneverthink(that)wearegoodineverythingwhileothersaregoodinnothing.我們決不能認為自己什么都好，別人什么都不好。注意：在dema

5、nd、order、suggest、decide、insist,desire,demand,request,command等表示要求、命令、建議、決定等意義的動詞后，賓語從句常用“（should）+動詞原形”。例如：iinsistthatshe(should)doherworkalone.我堅持要她自己工作。thecommanderorderedthattroops(should)setoffatonce.司令員命令部隊馬上出發(fā)。2.用who，whom,which,whose,what,when,where,why,how,whoever,whatever,whichever等關聯詞引導的賓語從

6、句相當于特殊疑問句，應注意句子語序要用陳述語序。例如：iwanttoknowwhathehastoldyou.我想知道他告訴了你什么。shealwaysthinksofhowshecanworkwell.她總是在想怎樣能把工作做好。shewillgivewhoeverneedshelpawarmsupport.凡需要幫助的人，她都會給予熱情的支持。3.用whether或if引導的賓語從句，其主語和謂語的順序也不能顛倒，仍保持陳述句語序。此外，whether與if在作“是否”的意思講時在下列情況下一般只能用whether，不用if：ca.引導主語從句并在句首時；b.引導表語從句時；.引導從句作介

7、詞賓語時；d.從句后有“ornot”時；e.后接動詞不定式時。例如：whetherthereislifeonthemoonisaninterestingquestion.月球上有沒有生命是個有趣的問題。everythingdependsonwhetherwehaveenoughmoney.一切要看我們是否有足夠的錢。4.注意賓語從句中的時態(tài)呼應，當主句動詞是現在時，從句根據自身的句子情況，而使用不同時態(tài)。例如：hestudiesenglisheveryday.（從句用一般現在時）hestudiedenglishlastterm.（從句用一般過去時）iknow(that)hewillstudye

8、nglishnextyear.（從句用一般將來時）hehasstudiedenglishsince1998.（從句用現在完成時）當主句動詞是過去時態(tài)（could,would除外），從句則要用相應的過去時態(tài)，如一般過去時，過去進行時，過去將來時等；當從句表示的是客觀真理，科學原理，自然現象，則從句仍用現在時態(tài)。例如：theteachertoldusthattomhadleftusforamerica5.think,believe,imagine,suppose等等動詞引起的否定性賓語從句中，要把上述主句中的動詞變?yōu)榉穸ㄊ?。即將從句中的否定形式移到主句中。例如：wedontthinkyouareh

9、ere.我們認為你不在這。idontbelievehewilldoso.我相信他不會這樣做。3.表語從句在句中作表語的從句叫表語從句。引導表語從句的關聯詞與引導主語從句的關聯詞大致一樣，表語從句位于連系動詞后，有時用asif引導。其基本結構為：主語+系動詞+that從句。例如：thefactisthatwehavelostthegame.事實是我們已經輸了這場比賽。thatiswhyhedidntcometothemeeting.那就是他為什么不到會的原因。itlooksasifitisgoingtorain.看上去天要下雨了。需要注意的，當主語是reason時，表語從句要用that引導而不是

10、because。例如：thereasonwhyhewaslatewasthathemissedthetrainbyoneminutethismorning選擇：1.“ismaryfromnewyorkcity”“idontknow_.”a.fromwhatcitydoesshecomefromb.fromwhatcityshecomec.whatcitydoesshecomefromd.whatcityshecomesfrom2._makesmistakesmustcorrectthem.a.whatb.thatc.whoeverd.whatever3.thereasonwhyididntgo

11、toshanghaiwas_anewjob.a.becauseigotb.becauseofgettingc.igotd.thatigot4.itworriedherabit_herhairwasturninggrey.a.whileb.thatc.ifd.for5.henrykilledthedog.illaskhimwhy_.a.didhedothatb.hedidthatc.hedidd.hehasdoneso6.haveyouseenhenrylatelymybosswantstoknow_.a.howheisgettingalongb.howishegettingalongc.wha

12、theisgettingalongd.whatishegettingalong7.itisgenerallyconsideredunwisetogiveachild_heorshewants.a.howeverb.whateverc.whicheverd.whenever8.heaskedme_withme.a.whatisthetroubleb.whatwrongwasc.whatwasthematterd.whattroubleitis9.iamsure_hesaidistrue.a.thatb.aboutthatc.ofthatd.thatwhat10.iwonderhowmuch_.a

13、.doesthewatchcostb.didthewatchcostc.thewatchcostedd.thewatchcosts11.maryis_someonemightrecognizeher.a.afraidofb.afraidaboutc.afraidthatd.afraidfor12.idontdoubt_hellcome.a.thatb.ifc.whatd.whether13.“whydidyougotothewrongclass,mr.wang”“well,iforget_iwassupposedtogoto.”a.whichtheroomb.whichroomc.whatwa

14、stheroomd.whatroomwasit14._surprisedmemostwas_suchalittleboyofsevencouldplaytheviolinsowell.a.thatwhatb.whatthatc.thatwhichd.whatwhich15._wegoswimmingeveryday_usalotofgood.a.ifdob.thatdoc.ifdoesd.thatdoes16.oneofthemenheldtheview_thebooksaidwasright.a.whatthatb.thatwhatc.thatwhichd.whichthat17.ihave

15、noidea_ornothehasfinishedthework.a.ifb.thatc.whetherd.which18.“doyouknow_”“hisfatherisadoctor.”a.whatishisfatherb.whoishisfatherc.whathisfatherisd.whohisfatheris19.theydiscussed_theycouldsettletheproblemwithoutothershelp.a.ifb.thatc.whatd.whether20.sheasked_.a.whatiwasdoingwhensherangmeupb.whatwasid

16、oingwhensherangmeupc.whensherangmeupwhatiwasdoingd.whendidsheringmeupwhatiwasdoing21.itsuncertain_theexperimentisworthdoing.a.ifb.thatc.whetherd.how22.theywouldhavefixedthetelephoneyesterday_itwasaholiday.a.exceptb.exceptforc.exceptthatd.butfor23._theboydidnttakemedicinemadehismotherangry.a.thatb.wh

17、atc.howd.which24._wecantgetseemsbetterthan_wehave.a.what,whatb.what,thatc.that,thatd.that,what25._youdontlikehimisnoneofmybusiness.a.whatb.whoc.thatd.whether26._wellgocampingtomorrowdependsontheweather.a.ifb.whetherc.thatd.where27._hereallymeansis_hedisagreeswithus.a.whatthatb.thatwhatc.whythatd.ifw

18、hat28._isgoingtodothejobwillbedecidedbythepartycommittee.a.thatb.whyc.howd.who29._wellfinishtranslatingthebookdependsonthetime.a.whenb.whyc.whatd.that30._thehousewillbebuiltwillbediscussedattomorrowsmeeting.a.ifb.wherec.thatd.what31._hewontgothereiscleartoallofus.a.howb.whatc.whyd.this32._youcomeorn

19、otisuptoyou.a.whatb.ifc.whyd.whether33._makesmistakesmustcorrectthem.a.whob.anyonec.whoeverd.anybody34._teamwillwinthematchisamatterofpublicconcern.a.whichb.thatc.ifd.how35.theproblemis_willgotothemeeting.a.whyb.whenc.whatd.who36.thatis_helikestheplacesomuch.a.thatb.whatc.whyd.how37.thatis_luxunoncelived.a.whatb.wherec.thatd.why38.whatimconsideringnow_themoneyweneed.a.isb.arec.wered.was39.canyoutellme_a.whoisthatgentlemanb.thatgentlemaniswhoc.whothatgentlemanisd.whomisthatgentleman40.weshouldthinkcarefullyabout_mr.needhamsaidatthemeeting.a.thatb.whatc