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1、名词性从句：主语从句，宾语从句，表语从句，同位语从句。一．主语从句：由一个从句来充当句子的主语的复合句。1._______theearthisroundistrue.A.WhatB.ThatC.WhereD.How2.__________(If,Whether)hewillcomehasn’tbeendecided.3.________youneedismorepracitce.A.WhatB.ThatC.AllwhichD.How4._________hasn’tbeendecided.A.WhenwillwehavethemeetingB.Whenwewillhav
2、ethemeeting5._________leavestheclassroomlastwillturnoffthelights.A.WhateverB.WhoeverC.WhoD.Whom6._________wassaidheremustbekeptsecret.A.WhateverB.WhoeverC.WhoD.What1).引导主语从句的连接词有：连词that,whether；连接代词who,whoever,what,whatever和which；连接副词when,where,how和why。注意：1.that在句中无词义，只起连接作用；连接代词和连接副词在句中
3、既保留自己的疑问含义、又起连接作用，在从句中充当从句的成分。2.表示“是否”时,只能用“whether”引导主语从句3.疑问词(when,where,why,what…)+陈述语序2).为了防止一些句子头重脚轻，通常用it做形式主语1.Itissaid________hisfatherwillcomebackfromJapan.A.WhatB.ThatC.AllwhichD.How2.Itissurprising_______theweatherissowarmforApril.A.thatB.whenC.whetherD.where3.Thattheearthisro
4、undistrue.=4.Whetherhewillcomehasn’tbeendecided.=5.Wheretheherowentisnotmentionedattheendofthestory.=用it做形式主语的常用句型Itisafact(ashame,apity,goodnews…)Itistrue(certain,clear…)Itissaid(reported,believed…)Itseems/happenedthat…Itworriedsbalotthat…注意：Itisimportant/natural/necessary/impossible/st
5、range/unusual/suggested/advised/ordered/requested/insisted/required…that中，从句谓语动词用“(should)+do”的形式,Itisnecessarythatwe________________(learn)Englishgrammarwell.Itissuggestedthatwe________________(notgo)outtoplay.3).Who,whom,which,what可以和ever构成合成词，引导从句，起加强语气的作用。但引导主语从句不能用nomatterwho/what…E
6、xercise:1.________thattheyfoundanunusualplantintheforest.A.ItissaidB.TheyaresaidC.ItsaidD.Itsays2._____causedtheaccidentisstillacompletemystery.A.WhatB.ThatC.HowD.Where3.____surprisedmemostwas_____suchalittlegirlofsevencouldplaytheviolinsowell.A.That;whatB.What;thatC.That;thatD.What;what
7、4._____helpedtosavethedrowninggirlisworthpraising.A.WhoB.AnyoneC.WhoeverD.Theperson5._______hepassedtheimportantbutdifficultexamisaverygoodthing. A.WhatB.AsC./D.That6._______hesawinhisofficethedaybeforeyesterdayisstillapuzzle. A.ThatB.WhoseC.WhichD.Whom7.______willbeincha
