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主语从句讲解
一、概述在句中起名词作用的各种从句,统称为名词性从句根据它们在句中的语法作用,这类从句又可分为主语从句、宾语从句、表语从句和同位语从句在主从复合句中,充当主语的从句叫做主语从句
①Howtheearthcameintoexistenceremainsamysterytous.地球是如何形成的对我们来说仍然是一个谜
②Itworriedthewomanthathersonwasalwaysplayingcomputergames.儿子一直在玩电脑游戏,这让这位女士很担心
二、引导主语从句的连接词引导主语从句的连接词有三类从属连词、连接代词和连接副词.从属连词that和whether/iflthat引导的主语从句©Thatmyparentsalwaystreatmeasalittlechildmakesmeveryunhappy.我的父母总是像对待小孩子那样对我,这让我很不开心
②Thatthecollegewilltakeinmorenewstudentsthisyearistrue.今年这所大学将招收更多新生是真的2whether/if引导的主语从句©Whetherhecanfinishhistaskontimeisofgreatimportance.他是否能按时完成他的任务非常重要©Whetherthesportsmeetingwillbeheldisnotcertainnow.运动会是否会举行现在还不确定【温馨提示】lthat在名词性从句中不充当任何成分,无词义,只起连接作用,宾语从句中的that有时可省略2whether在从句中不充当任何成分,起连接作用,意为“是否”,不可省略.连接代词引导主语从句连接代词引导主语从句,在从句中可以作主语、宾语、表语或定语常见的连接代词有whowhosewhomwhatwhichwhoeverwhomeverwhateverwhichever等@Whowillbringupthechildhasntbeendecidedyet.谁来抚养这个孩子还没有决定©Whichlifestyleisthemostbeneficialtoourhealthisstillunknown.还不知道哪种生活方式对我们的健康最有利©Whoeverlovestheirchildrenwillbelovedbytheirchildren.爱孩子的父母会被孩子爱©Whateveryoudoshoulddonoharmtoothers.无论你做什么都不应该伤害别人【温馨提示】lwhat引导主语从句时在从句中作主语、宾语、表语或定语,相当于定语从句中的“先行词+关系代词的形式,表示“……的事情时间、地点、样子等What=Thethingthatyoudidyesterdaywasright.昨天你做得对Shemadeatriptowhat=theplacethatwasonceabattlefield.她到以前曾是一个战场的地方去旅游了2“疑问词+ever”既可引导主语从句,又可引导让步状语从句但是“nomatter+疑问词”只能引导让步状语从句Whoeverbreaksthelawshouldbepunished.主语从句任何违法的人都应该受到惩罚Whoever=Nomatterwhobreaksthelawheshouldbepunished.让步状语从句无论谁违反法律,都应该受到惩罚.连接副词引导主语从句连接副词引导主语从句并在从句中作状语,表示时间、地点、原因、方式等连接副词有whenwherewhyhow等@Howthebookwillselldependsonitsauthor.这本书如何销售取决于作者本人
②Whereweshallhavethemeetingmakesnodifference.我们在哪儿开会都无所谓
三、主语从句与形式主语it有时为了考虑句子平衡,通常在含有主语从句的复合句中使用形式主语it而将真正的主语从句移至句末常见的用形式主语it的主语从句结构有lItbe+名词词组+主语从句常用于这种句型的名词有apityashameafactanhonourawondernowonder等Itisapitythatshehasmadesuchamistake.她犯了这样一个错误,真是遗憾2Itbe+形容词+主语从句Itsstrangethatheshouldhavetakenthebookswithouttheownerspennission.真奇怪,他居然没有得到主人的允许就把书拿走了3Itbe+过去分词+主语从句Itisbelievedthatatleast20buildingsweredamagedordestroyed.人们认为,至少有二十栋建筑遭到破坏或彻底毁掉4It+不及物动词happenseem叩pearetc.+主语从句IthappenedthatIhadbeenawaywhenhecalled.他打电话时,我碰巧不在家5It+及物动词+宾语+that从句Itsurprisedmethatourparentswouldntliketoacceptnewthings.让我吃惊的是我们的父母不愿意接受新事物课后训练DadthinksIamanarcissistbutIsayisthatmypicturesarenthurtinganyonesowhocaresIt*strueinnerbeautyisveryimportantbutexternalbeautycantbecompletelyoverlooked.hemanagedtofinishthetaskbyhimselfisstillamysterytome.wegotherebytrainorbyairmakesnodifference.hewasabsentfromthemeetingremainsamystery.Ifsknownknowledgeistreasureandpracticeisthekeytosuccess.Accordingtotherules屈Istoreturnthebooksontimewillhavetheiraccountsfrozen.hewillattendthemeetingornottomorrowdependsonhistimeschedule.hewillcomebackfromCanadaisn*tknownsoIwillcallhimuptochecktheexacttime.Itisobvioustothestudentstheyshouldgetwellpreparedfbrtheirfuture.参考答案提升训练willtakechargeofourclasshasn*tbeendecidedsofar.makesthefilmsoextraordinaryisthecreativeimaginationofthedirectorlifeexistsonanyotherplanetinthesolarsystemstillremainsaquestion.theheadteacherpresentaspeechonthegraduateceremonyisalong-heldtraditionatthishighschool.isknowntousallisthatthesportmeetingwilltakeplaceinParisthissummer.Itisprettywellunderstoodcontrolsthecarbondioxideinandouttheatmospheretoday.wemakefriendsandcommunicatewiththemhaschangeddramaticallycomparedwiththepast.Itstrueinnerbeautyisveryimportantbutexternalbeautyshouldntbecompletelyoverlooked.Doesitmattertoyouhefinishedthejobontimethehousewillbebuiltwillbediscussedattomorrowsmeeting.whatIhatHowWhetherWhythatwhoeverWhetherWhenthatwhowhatwhetherThatWhatwliatHowthathowWhere。