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时间:2019-03-10
《主语从句讲解及其练习2》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、主语从句一、主语从句的连词分三类(1)从属连词引导的主语从句(thatwhetherif)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。That引导主语从句通常用it作形式主语。例如:Thatyouwillwinthemedalseemsunlikely.Thatshesurvivedtheaccidentisamiracle.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。注意:引导主语从句,不能用if不能在开头,只能用whether。Whetherwewillholdapartyintheope
2、nairtomorrowdependsontheweather.Whethersheiscomingornotdoesn’tmattertoomuch.(2)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.例如:Whatyouneedismorepractice.Whateverwedoistoservethepeople.注:whatever/whoever的功用whatever,whoe
3、ver在主语从句中不含疑问意义。它引导主语从句,并在从句中作主语、宾语、表语等。whatever=anythingthat;whoever=anyonewho。要注意和whatever,whoever引导的让步状语从句的区别。如:Whoeverbreaksthelawshouldbepunished.(主语从句)(=Anyonewhobreaksthelawshouldbepunished.)Whoeverbreaksthelaw,heshouldbepunished.(让步状语从句)(=Nomatterwhobreaksthelaw,heshouldbepun
4、ished.)(3)用连接副词when,where,why,how引导的名词性从句(其连接副词有含义,在句中作状语。)例如:Whereweshouldleaveitisaproblem.Whentheywillcomehasn’tbeenmadepubic.三、it作形式主语的主语从句有时为了考虑句子平衡,通常在主语从句处使用形式主语it,而将真正的主语从句移至句末。这分四种情况:(1)对于以连词that引导的主语从句,通常用形式主语it替代主语从句:Itis+名词+从句Itisafactthat…事实是……;Itisgoodnewsthat………是好消息
5、;Itisaquestionthat………是个问题;Itiscommonknowledgethat………是常识类似的名词还有:apity;awonder;agoodthing;nowonder;surprise等。Itisamysterytomehowitallhappened.Itiscommonknowledgethatthewhaleisnotafish.ItisnosurprisethatBobshouldhavewonthegame.Itis+形容词+从句Itisnecessarythat…有必要……;Itisclearthat…很清楚……;It
6、islikelythat…很可能……;Itisimportantthat…重要的是……类似的形容词还有:strange;natural;obvious;true;good;wonderful;possible;unlikely;quite;unusual;certain;evident;worth-while;surprising;interesting;astonishing,etc.Itisdoubtfulwhethershewillbeabletocome.Itisessentialthatheshouldbeherebytheweekend.Itseem
7、sobviousthatwecannotgoonlikethis.Itisnecessarythatyou(should)masterthecomputer.需要注意的是这类主语从句中,谓语动词很多为“(should)+动词原形”,即要用虚拟语气。Itis+过去分词+从句Itissaidthat…据说……;Itisreportedthat…据报道……;Ithasbeenprovedthat…已证明……;Itmustbeprovedthat…必须指出……类似的过去分词还有:known;estimated;expected;believed;thought;h
8、oped;noted;d
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