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1、TheSubjectClause主语从句名词性从句（三）1一、主语从句的定义二、主语从句的构成三、主语从句的引导词四、it可作形式主语五、主语从句需注意的问题2找出下列句子中的主语：1)Youareastudent.2)Hisjobisimportant.3)Tofindyourwaycanbeaproblem.4)Smokingisbadforyou.5)Whathedoesisimportant.主语是动作的发出者或受到描述的对象。通常位于谓语动词或系动词之前。3一、主语从句的定义：在复合句中位于谓语动词或系动词之前充当主语的句子，叫主语从句。Thatheisstillalive
2、isawonder.二、主语从句的构成：引导词+简单句+谓语动词/系动词+其他成分.Whathewantsisabook.4三、主语从句的引导词：从属连词:that,whether；连接代词:who,whom,whose,which,what；whatever，whoever，whichever连接副词:when,where,how,why。5thatthat引导主语从句,that在从句中只起连接作用，不作成分，没有意义，不能省略。Thathewillcomeiscertain.2.whether1)whether引导主语从句，译为“是否”,不能省略。if不能引导表语从句。Wheth
3、erhe’ll come hereisaproblem.63.who,whom,whose,what,whichwhen,where,how,why1)wh-词各有自己的实际意义，2)在从句中作成分，3)不能省略，4）从句中要用陈述语序。Whowillwritethepoemhasnotbeendecidedyet.Whomsheborrowedmoneyfromstillpuzzledhim.Whichsidewillwinisnotclear.Whatshesaidtodaywasquiteright.7Whenhewillbebackdependsontheweather.Wh
4、erethetestwillbegivenisnotyetdecided.Whereandwhenhewasbornisasecret.Whyhecamehereisnotknown.Howwecanprotecttheendangeredanimalsneedstobediscussed.Howmanypeoplediedintheearthquakewasunknown.8注意：whatever，whoever，whichever在主语从句中不含疑问意义。它引导主语从句，并在从句中作主语、宾语或表语等。Whoevercomeswillbewelcome.(whoever=thep
5、ersonwho)来的人将受到欢迎。Whateverhedidwasright.(whatever=thethingthat)他所做的事情是正确的。Whicheverofyoucomesinwillreceiveaprize.(whichever=anyoneofyouwho)你们当中不论哪个进来将会得到奖励。9四、it可作形式主语为了使句子保持平衡，避免头重脚轻,经常用it作形式主语,主语从句放在后面作真正的主语.其结构为：It+谓语动词/系动词+宾语/表语+主语从句.例如:Thatweshallbelateiscertain.=Itiscertainthatweshallbela
6、te.1.Thattheearthisroundisknowntoall.=Itisknowntoallthattheearthisround.2.whethertheywouldsupportuswasaproblem.=Itwasaproblemwhethertheywouldsupportus.101.It+be+形容词+that从句(obvious, true, surprising, good, wonderful, funny, possible,likely, certain, …)如：It is certainthatshe will do well in her e
7、xam.2.It+be+名词词组+that从句(an honor, a fact, a pity, …）如：It’s a pitythatwe can’t go.用it作形式主语的结构：113. It+be+过去分词+that从句(said, reported,believed,suggested,known,thought, expected, decided, …）如：It is saidthatMr. Green has arriv
