主语从句和表语从句课件.ppt

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1、NounClause名词性从句名词性从句包括主语从句、表语从句、宾语从句和同位语从句。它的功能相当于名词，引导名词性从句的引导词归纳起来可分为以下三类。GrammarWhatpartdoestheunderlinedpartserveasineachsentence?Atreehasfallenacrosstheroad.Youareastudent.Tofindyourwaycanbeaproblem.Smokingisbadforyou.“Howdoyoudo?”isagreeting.Whats

2、hesaidisnotyetknown.Thatweshallbelateiscertain.Itiscertainthatweshallbelate.MakesentencesIt’scertainthatwewillbelate.Thatwe’llbelateiscertain.Wedon’tknowwhetherheiscomingornotWhetherheiscomingisnotknown.Wedon’tknowwhathewantstotellus.Whathewantstotellusi

3、snotknown.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，which与—ever；连接副词when,where,how和why。主语从句：做主语用的名词性从句，因其在复合句中做主语，又称主语从句，引导主语从句的有连词t

4、hat，whether，连接代词who，what，which，连接副词when，where，how，why等。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，但不能省略。Thatshelefthimcuthimtotheheart.Thathewillcomeiscertain.2)连接代词who，what，which,whatever,whichever,whoeverWhatseemseasytosomepeople

5、seemsdifficulttoothers.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等。Whyhediditremainsamystery.Whentheywillstartisnotknownyet.Howhebecameagreatscientistisknowntousall.2.位置：主语从句可以前

6、置，也可以后置。用it做形式主语，而把主语从句放在句末，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.Itisafact(ashame,apity,goodnews…)that…Itiscertainthatshewilldowellinherexam.ItistruethatItoldhereve

7、rything.ItissaidthatMr.GreenhasarrivedinBeijing.ItisreportedthatChinahassentanothermanmadeearthsatelliteintoorbit.2）It+不及物动词+主语从句Itseemed(happened,doesn’tmatter,hasturnedout)that…Ithappensthattheywereabsent.ItseemsthatAliceisnotcomingtothepartyatall.Itdo

8、esn’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，而把主语从句放在句末时，从属连词that可