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1、名词性从句GrammarandusageNounClauses名词性从句GrammarandusageNounClauses在复合句中起名词作用的从句叫名词从句(NounClauses)。名词从句的功能相当于名词词组,它在复合句中能担任主语、宾语、表语、同位语、介词宾语等，因此根据它在句中不同的语法功能，名词从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。名词从句Hisjobisimportant.Whathedoesisimportant.Thisishisjob.Thisiswhat
2、hedoeseveryday.{名词性从句在功能上相当于名词主语表语{{Idon’tlikehisjob.Idon’tlikewhathedoeseveryday.Idon’tknowabouttheman,Mr.White.Idon’tknowaboutthefactthatheisateacher.宾语同位语{Atlunchtime,theradioweathermanreportedthatthemistwouldbecomeathickfogintheafternoon.Thetruthi
3、sthatthefogistoothickforthebustorunthatfar.Whatsurprisedmemostwasthattheoldmancouldn’tseeanything.ThefactthatPollydidn’taskfortheman’snameisapity.Findclausesfromthefollowingsentencesandtellthefunctionsofthem.AppositiveClause(同位语从句)SubjectClause(主语从句)O
4、bjectClause(宾语从句)PredicativeClause(表语从句)引导名词性从句的连接词连接词that,if,whether,asif（不充当任何成分）疑问代词who,whom,what,which，whoever,whose等疑问副词when,where,how,why主语从句SubjectClause主语从句是在复合句中充当主语的从句，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。主语从句做主句的主语。如：Whatwehavedoneisintheintere
5、stofthepeople.引导主语从句的词有：连词：that,whether代词：what,who,which等副词：when,where,how,why1Thathewillsucceediscertain.2Whetherhewillgothereisnotknown.3Whathesaidisnottrue.4Wherehehidthemoneyistobefoundout.5Whoevercomesiswelcome.6Howwecanhelpthetwinswillbediscusse
6、datthemeeting.为避免主语冗长,句子头重脚轻,经常用it作形式主语,主语从句放在后面作真正的主语。1.Itiscertainthathewillsucceed.2.Itisnotknownwhetherhewillgothere.“It”isusedasemptysubject形式主语(1)Itis＋名词＋从句Itisafactthat…ItisanhonorthatItiscommonsensethat(2)Itis＋形容词＋从句Itisnaturalthat…Itisstrange
7、that…(3)Itis＋过去分词＋从句Itisreportedthat…Itissaidthat…(4)It＋不及物动词＋从句Itseemsthat…Ithappenedthat…Itappearsthat…it作形式主语的结构主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时，谓语动词要用虚拟语气“(should)+do”，常用的句型有：Itisnecessary(important,natural,strange,etc.)that… Itisapity(ashame,nowonder,
8、etc.)that… Itissuggested(requested,proposed,desired,etc.)that…宾语从句宾语从句就是在复合句中作宾语的名词性从句，通常放在主句谓语动词(及物动词)或介词之后。1）引导宾语从句的词有：连词：that,whether,if代词：who,whose,what,which副词：when,where,how,why例如：Ithink(that)watchingTVtoomuchisbadforpeople'shealth.Iwond
