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1、Grammar—thesubjectclauses语法—名词性从句之主语从句I、概述在复合句中起主语作用的从句叫主语从句。引导主语从句的关联词有从属连词that、whether，关系代词：who,what,which,whom,whose,whatever,whoever,whomever,whichever；关系副词：when,where,how,why,however,whenever,wherever等。含有主语从句的句子，谓语动词多用第三人称单数形式。语序为陈述语序。Thatyoudon’tlikehimisnoneofmybusiness.你不喜欢她不管我的事。Whathesaid
2、istrue.Whetherthefootballgamewillbeplayeddependsontheweather.II.分类详解1.从属连词that，whether引导的主语从句。从属连词that，whether在主语从句中的作用只是引导主语从句，它们在从句中不做成分，不能省略。Whethershewillcomeornotisstillaquestion.她是否会来仍是一个问题。Thattheywillgoiscertain.他们去是肯定的。2.it作形式主语引导主语从句。如果主语从句太长，为避免句子结构头重脚轻，常用it作形式主语，而把主语从句放在主句谓语部分之后。That引导的
3、主语从句可用it代替，that不可省略。用作it作形式主语的结构：(1).Itis/was+形容词+that从句It’snaturalthat…很自然……It’sobviousthat…显而易见……It’sfortunatethat…幸运的是It’s(im)possible…（不）可能……It’sunlikelythat…不可能It’sstrangethat…奇怪的是……(2).Itis/was+名词+that从句It’sapitythat…遗憾的是……It’safactthat…事实是……It’sgoodnewsthat…是好消息……It’sawonderthat…不足为奇……It’san
4、honourthat…非常荣幸……It’sashamethat…真是可耻……It’scommonknowledgethat…是常识…(3).Itis/was+过去分词+that从句It’snotknownthat………不得而知It’ssaidthat…据说……It’sreportedthat…据报道……It’snotdecidedthat…尚未决定It’sbelievedthat…据认为……It’sannouncedthat…据宣布……It’ssuddenlystruckmethat…我突然想到（感觉到）……(4).It+不及物动词+that从句Itseemsthat…似乎……Ithappe
5、nedthat…碰巧……Itappearsthat…看来……Itturnsoutthat…结果……Itoccurstomethat…我突然想起……(5).其他Itdoesn’tmatter…是无关紧要的Itmakesnodifference…毫无区别……Itisoflittleconsequencethat…无关紧要4Itisapitythatshehasmadesuchamistake.It'sstrangethathedidn'tcomeyesterday.ItissaidthathehasgonetoShanghai.(=HeissaidtohavegonetoShanghai)Its
6、eemsthathehasseenthefilm.ItoccurredtomethatIfailedintheexamination.Itdoesn’tmatterwhetherheiswrongornot.Itmakesnodifferencetomewhetheryougoornot.3、由关系代词引导的主语从句。（1）关系代词who,what,which,whom,whose,whatever,whoever,whomever,whichever等，引导主语从句时，它们分别在从句中担任主语、宾语或定语，不能省略。Whoeverleavestheroomlastoughttoturnof
7、fthelights.Whatyouhavedonemightdoharmtootherpeople.。Whomadethelongdistancecallisnotimportant.（2）what引导主语从句“……的东西/事情”时，可用来表示thething(s)which这种意思，引导从句，表示一样东西与一件事情。what，who，whom，which，可以和ever构成合成词，和what一样引导从句，
