高考复习英语主语从句语法讲解

二、主语从句1．定义：用作主语的从句叫做主语从句。2．构成：关联词+简单句3．引导主语从句的关联词有三类：(1)从属连词that。如：Thattheywereintruthsisterswasclearfromthefacialresemblancebetweenthem.很明显，她们确是亲姐妹，她们的脸型很相似。(2)从属连词whether。如：Whetherhe’llcomehereisn’tclear.他是否会来这里还不清楚。(3)连接代词who,whom,whose,what,which,whoever,whatever,whichever连接副词where,when,how,why。如：Whatshedidisnotyetknown.她干了什么尚不清楚。Howthishappenedisnotcleartoanyone.这事怎样发生的，谁也不清楚。Whoevercomesiswelcome.不论谁来都欢迎。Whereveryouareismyhome----myonlyhome.你所在的任何地方就是我的家----我唯一的家。解释：1．主语从句能用it作形式上的主语。常以it作形式主语的句型有：A.It+be+形容词(obvious,true,natural,surprising,good,wonderful,funny,possible,likely,certain,probable,etc.)+that从句。如：Itiscertainthatshewilldowellinherexam.毫无疑问她考试成绩会很好。Itisprobablethathetoldhereverything.很可能他把一切都告诉她了。B.It+be+名词词组(nowonder,anhonour,agoodthing,apity,nosurprise,etc.)+that从句。如：It’sapitythatwecan’tgo.很遗憾我们不能去。It’snosurprisethatourteamshouldhavewonthegame.我们没赢这场比赛真意外。C.It+be+过去分词(said,reported,thought,expected,decided,announced,arranged,etc.)+that从句。如：ItissaidthatMr.GreenhasarrivedinBeijing.据说格林先生已经到了北京。ItisreportedthatChinahassentanotherman-madeearthsatelliteintoorbit.据报道中国又成功地发射了一颗人造地球卫星。D.It+seem,happen等不及物动词及短语+that从句。如：ItseemsthatAliceisnotcomingtothepartyatall.Alice似乎不来参加晚会。IthappenedthatIwasoutthatday.碰巧我那天外出了。E.It+doesn’tmatter(makesnodifference,etc.)+连接代词或连接副词引起的主语从句。如：Itdoesn’tmatterwhethershewillcomeornot.她是否来这无关紧要。Itmakesnodifferencewhereweshallhavethemeeting.我们在哪里开会毫无区别。F.当that引导的主语从句出现在疑问句中时，要以it作形式主语，而把主语从句后置。如：Isittruethatthescientistwillgiveusalecturenextweek?下周那位科学家将给我们作报告是真的吗？Doesitmattermuchthattheywillnotcometomorrow?他们明天不来很要紧吗？G.当主语从句出现在感叹句中时，要以it作形式主语，而把主语从句后置。如：Howstrangeitisthatthechildrenaresoquiet!孩子们这么安静真奇怪！2．注意连接代词whoever,whatever,whichever等引导主语从句的含义Whoevercomeswillbewelcome.(whoever=thepersonwho)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