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1、NounClause 名詞性從句名詞性從句包括主語(yǔ)從句、表語(yǔ)從句、賓語(yǔ)從句和同位語(yǔ)從句。它的功能相當(dāng)于名詞，引導(dǎo)名詞性從句的引導(dǎo)詞歸納起來(lái)可分為以下三類。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.主語(yǔ)從句 （NounClausesastheSubject）定義：用作主語(yǔ)的從句叫主語(yǔ)從句，它是名詞性從句之一。引導(dǎo)主語(yǔ)從句的連接詞有：連詞that,whether；連接代詞who,what，which與—ever；連接副詞when,where,how和why。主語(yǔ)從句：做主語(yǔ)用的名詞性從句，因其在復(fù)合句中做主語(yǔ)，又稱主語(yǔ)從句，引導(dǎo)主語(yǔ)從句的有連詞t
4、hat，whether，連接代詞who，what，which，連接副詞when，where，how，why等。1.連接詞：1）從屬連詞：that，whether等.that引導(dǎo)主語(yǔ)從句只起引導(dǎo)作用，本身無(wú)實(shí)際意義，在主語(yǔ)從句中不充當(dāng)任何成分，但不能省略。Thatshelefthimcuthimtotheheart.Thathewillcomeiscertain.2)連接代詞who，what，which,whatever,whichever,whoeverWhatseemseasytosomepeople
5、seemsdifficulttoothers.Whichsidewillwinisnotclear.由whether及其他連詞引導(dǎo)的主語(yǔ)從句放在句首，句后都可。Whetheritwillpleasethemisnoteasytosay.3)連接副詞when，where，how，why等。Whyhediditremainsamystery.Whentheywillstartisnotknownyet.Howhebecameagreatscientistisknowntousall.2.位置：主語(yǔ)從句可以前
6、置，也可以后置。用it做形式主語(yǔ)，而把主語(yǔ)從句放在句末，常用下面幾種句型。1）It+be+表語(yǔ)+主語(yǔ)從句表語(yǔ)：（名詞，形容詞，過(guò)去分詞）Itisstilluncertainwhetherheiscomingornot.ItisanhonourthatIwasinvitedtoattendthemeeting.Itisafact(ashame,apity,goodnews…)that…Itiscertainthatshewilldowellinherexam.ItistruethatItoldhereve
7、rything.ItissaidthatMr.GreenhasarrivedinBeijing.ItisreportedthatChinahassentanothermanmadeearthsatelliteintoorbit.2）It+不及物動(dòng)詞+主語(yǔ)從句Itseemed(happened,doesn’tmatter,hasturnedout)that…Ithappensthattheywereabsent.ItseemsthatAliceisnotcomingtothepartyatall.Itdo
8、esn’tmatterwhethershewillcomeornot.Itmakesnodifferencewhereweshallhavethemeeting.3)It+及物動(dòng)詞（被動(dòng)語(yǔ)態(tài)）+主語(yǔ)從句IthasbeendecidedthattheexhibitionwillnotopenonSundays.注意:1）主語(yǔ)從句在句首時(shí)，必須由連接詞引導(dǎo)，不能省略這些連接詞；但是如果用it做形式主語(yǔ)，而把主語(yǔ)從句放在句末時(shí)，從屬連詞that可
