主语从句PPTPPT课件.ppt

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1、GrammarWhatpartdoestheunderlinedpartserveasineachsentence?Atreehasfallenacrosstheroad.Youareastudent.Tofindyourwaycanbeaproblem.Smokingisbadforyou.“Howdoyoudo?”isagreeting.Whatshesaidisnotyetknown.Thatweshallbelateiscertain.Itiscertainthatweshallbelate.MakesentencesIt’scert

2、ain.we’llbelate.Ishecomingornot？Wedon’tknowWhatdoeshewanttotellus?Wedon’tknowWhenwillyoucomeback?Itdoesn’tmatter.It’scertainthatwewillbelate.Thatwe’llbelateiscertain.Wedon’tknowwhetherheiscomingornotWhetherheiscomingisnotknown.Wedon’tknowwhathewantstotellus.Whathewantstotel

3、lusisnotknown.Whenyouwillcomebackdoesn’tmatter.Itdoesn’tmatterwhenyouwillcomeback.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。1.连接词：1）从属连词：that，whether等.that引导主语从句只起引导作用，本身无实际意义，在主语从句中不充当任何成分，但

4、不能省略。Thatshelefthimcuthimtotheheart.Thathewillcomeiscertain.2)连接代词who，what，which,whatever,whichever,whoeverWhatseemseasytosomepeopleseemsdifficulttoothers.Whichsidewillwinisnotclear.由whether及其他连词引导的主语从句放在句首，句后都可。Whetheritwillpleasethemisnoteasytosay.3)连接副词when，where，how，why

5、等。Whyhediditremainsamystery.Whentheywillstartisnotknownyet.Howhebecameagreatscientistisknowntousall.2.位置：主语从句可以前置，也可以后置。用it做形式主语，而把主语从句，在句末，常用下面几种句型。1）It+be+表语+主语从句表语：（名词，形容词，过去分词）Itisstilluncertainwhetherheiscomingornot.ItisanhonourthatIwasinvitedtoattendthemeeting.Itisafa

6、ct(ashame,apity,goodnews…)that…Itiscertainthatshewilldowellinherexam.ItistruethatItoldhereverything.ItissaidthatMr.GreenhasarrivedinBeijing.ItisreportedthatChinahassentanothermanmadeearthsatelliteintoorbit.2）It+不及物动词+主语从句Itseemed(happened,doesn’tmatter,hasturnedout)that…Ith

7、appensthattheywereabsent.ItseemsthatAliceisnotcomingtothepartyatall.Itdoesn’tmatterwhethershewillcomeornot.Itmakesnodifferencewhereweshallhavethemeeting.3)It+及物动词（被动语态）+主语从句IthasbeendecidedthattheexhibitionwillnotopenonSundays.注意:1）主语从句在句首时，必须由连接词引导，不能省略这些连接词；但是如果用it做形式主语，而

8、把主语从句放在句末时，从属连词that可以省略。误：Theyshouldlikeeachotherisnatural.正：Thattheyshouldlikeeac