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1、主语从句Grammar3.Tofindyourwaycanbeaproblem.Whatpartdoestheunderlinedpartserveasineachsentence?2.Smokingisbadforyou.1.Youareastudent.4.“Howdoyoudo?”isagreeting.5.Whatshesaidisnotyetknown.6.Thatweshallbelateiscertain.7.Itiscertainthatweshallbelate.subjectA
2、sentenceservingassubjectiscalledSubjectClause.主语从句 （NounClausesastheSubject）定义：用作主语的从句叫主语从句，它是名词性从句之一。引导主语从句的连接词有：连词that,whether；连接代词who,what和which；连接副词when,where,how和why。that,whetherthat在主语从句中本身没有意义,不充当句子成分,位于句首时,不能省略.e.g.Thatlighttravelsinstraightli
3、nesisknowntoall.whether“是否”,不充当句子成分.e.g.Whetherwe’llgooutdependsontheweather.what,who,whom,which(连接代词);when,where,why,how(连接副词);这一类连接词在主语从句中可分别作主语、宾语、表语、状语、和定语。e.g.Whowilldoitdoesn’tmatter.Whatweneedismorewater.Whichisbetterremainstobeseen.Whoheisisst
4、illnotknowntous.Wherethelibraryistobebuilthasnotbeendecidedyet.Whyshewaslateforschoolisquiteclearnow.Whichplanisbetterwillbeannouncedlater.作主语作宾语作主语作表语作地点状语作原因状语作定语whatever,whoever,whomever,whichever这一类连接词与what,who,whom,which(连接代词)的用法一样，在句中可作主语、宾语、表语和
5、定语。但语气较强，有“凡是，不管，无论”之意。Whateverhesaidwasn’ttrue.WhoeverguesseswhatIhaveinmyhandmayhaveit.Whicheverbookyouchooseisyours.作宾语作主语作定语*what&whateverwho&whoeverwhich&whichever引导名词性从句的区别1.___________isworthdoingisworthdoingwell.2.__________weneedismoretime.3.
6、___________madethelongdistancecalltohimisnotimportant.4.___________breaksthelawwillbepunished.whatever/whoever/whichever等引导的名词性从句不含有疑问意义，相当于名词后加一个定语从句，而what/who/which等引导的名词性从句都含有疑问意义。WhateverWhatWhoWhoever注意:上述例句中的主语从句都是放在句首,但有时为了使句子结构平衡,避免“头重脚轻”,常用it
7、作形式主语,而把从句放在后面。例如:Itisapitythatshehasmadesuchamistake.她犯了这样一个错误,真是遗憾。Canyourewritethefollowingsentences.1.Thattheearthturnsaroundthesunisknowntoall.2.Thatpricewillgoupiscertain.3.Thattheyarebadlyinneedofhelpisquiteclear.Itisknowntoallthattheearthturns
8、aroundthesun.Itiscertainthatpricewillgoup.Itisquiteclearthattheyarebadlyinneedofhelp.It+be+形容词＋that从句Itisnecessarythat…有必要…Itisimportantthat….重要的是…Itisobviousthat……很明显……It+be+-ed分词＋that从句Itisbelievedthat…人们相信…Itisknowntous/allthat….众所周知…Ithasb
