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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，引导主语从句的有从属连词that,whether，连接代词who,what,which，连接副词when,where,how,why等。•从属连词：that•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。Thathewillwiniscertain.•注意：为了避免主语冗长,句子头重脚轻,经常用it作形式主语,主语从句放在后面作真正的主语.•Itiscertainthathewillwin.•Thattheearthisroundisknowntoall•--It’sknowntoallthattheearthisround.这样就构成了下面一些句型•1）It+be+形容词＋that从句•————————（很重要）weshouldlearnEnglishwell.•2）It+be+名词＋that从句•__________（很遗憾)welostthematch.ItisimportantthatItisapitythat3）It+be+-ed分词＋that从句•Itisknowntous/allthat….众所周知…•Itissaid(reported,thought,believed)that…...据说(据报道.人们认为，相信….）•Itissuggested(demanded,requestedordered,commanded,insisted,)that+（should）do…建议(请求，命令)•Itissuggestedthatthemeeting(should)beputoff.4)It+不及物动词＋that从句•Itappears（seems）that…似乎…•Ithappensthat….碰巧…•Itoccurredtomethat……我突然想起……____________(碰巧)IcameintotheofficeatthattimeIthappenedthatIt做形式主语在高考真题中的应用•Itisnecessarytobepreparedforthejob.Havingtheanswersreadyisofgreathelp.•TheForeignMinistersaid,“Itisourhopethatthetwosideswillworktowardspeace.”•Itisknowntoeverybodythatthesuntravelsroundtheearth.what引导主语从句时在句时在从句中充当句子成分，如主语．宾语．表语，而that则不然。例如：1)Whatyousaidyesterdayisright.2)Thatsheisstillaliveisnotclear.What在此引导主语从句,又做said的宾语That只起连接作用,不做成分what与that在引导主语从句时的区别It’scertain.we’llbelate_______________iscertain.ThathewillbelateIt’scertainthatwewillbelate.Hesaidsomethingatthemeeting.Itshockedeverybody._____hesaidatthemeetingshockedeverybody.Whatplaymusicmakehappytheyplaymusicmakesthemhappy.ThatThemanwindowsbrokebroughttroublethemanbrokethewindowsbroughthimtrouble.Thattalkabouttheuseofcellphonetheyaretalkingaboutistheuseofcellphone.WhatWhatoverturn打翻thecatoverturnedthepaintmadecrythecatoverturnedthepaintmadethebabycry.ThatdidWhatWhat主语从句的规律(找出下列句子的错误，并改正过来)•Whenwillhecomeisnotknown.规律一：主语从句一律用陈述语序。即主语在前，谓语在后。Whenhewillcomeisnotknown.•Hewillnotcometothemeetingthiseveningistrue.•规律二：连词that在从句中无实际意义，但不能省略。正：Thathewillnotcometothemeetingthiseveningistrue.•Whenhewillcomeareapuzzle.•规律三：含主语从句的主句谓语动词常用第三人称单数。正.Whenhewillcomeisapuzzle.•Whatheneedsisthatbook.•规律四：What引导的主语从句，可根据表语决定主句动词的单复数形式。Whatheneedsaresomebooks.1.___hemadeanimportantspeechatthemeetingwastrue.A.ThatB.WhyC.WhatD.How2.___we’llgocampingtomorrowdependsontheweather.AIfBWhetherCThatDWhere3.___isknowntousallisthatAmericaisadevelopedcountry____theFirstWorld.a.Which;belongtob.As,belongedtoc.What;belongingtod.It;belongingto众所周知的多种表达•Itisknowntousthatsmokingisharmfultoourhealth.•Asisknowntous,smokingisharmfultoourhealth.•Whatisknowntousisthatsmokingisharmfultoourhealth.4.It’sknowntousall___aformofenergy.A.waterisB.thatwaterisC.iswaterD.thatwaterto5.Itworriedherabit___herhairwasturninggray.A.whetherB.ThatC.whatD.when6.WhatIsayandthink___noneofyourbusiness.A.isB.areC.hasDhave