高中英语 必修3 名词性从句

名词性从句,NounClauses,名词性从句分四类：主语从句、宾语从句、表语从句和同位语从句，在用法上相当于名词。,1.Whenwewillstartisnotclear.2.MrsBlackwontbelievethathersonhasbecomeathief.3.Myideaisthatweshoulddoitrightnow.4.Ihadnoideathatyouwereherfriend.,主语从句,宾语从句,表语从句,同位语从句,名词性从句由连接词、连接代词和连接副词引导，为陈述语序。,连接词在从句中不做成分。连接代词在从句中作主语、表语、定语或宾语。连接副词在从句中作状语。,when,where,how,why,that,whether/if,asif,who,whom,whose,which,what,1Ithink(that)hellbeallrightinafewdays.2HetoldmewhatIshouldread.3Payattentiontowhattheteachersaid.4Wecametowherehelived.5Hehasmadeitclearthathewillnotgivein.6Idontdoubt_hecanspeakEnglish.7Idontthinkthisdressfitsyouwell.,宾语从句：,that,用if和whether填空Iwonder_itisbigenoughornot.Ihaventsettledthequestionof_Illgobackhome.,1.宾语从句可放在主句谓语动词或介词之后。2.it常可以放在动词think,find,consider,believe,feel,make等后作为形式宾语,后接宾补，真正的宾语-that从句则放在句尾.3.否定前置,注意,whether,whether,1.Thequestioniswhetherthatmanwillturnupintime.2.Tomisnolongerwhatheusedtobe.3.ThatswhereIcantagreewithyou.4.Thisishowtheyovercomethedifficulties.5.Itsoundsasif/thoughsomebodywasknockingatthedoor.,表语从句：,注意,1.ThereasonwhyIamlateisbecauseIoverslept.2.asif/though引导的表语从句常置于连系动词look,seem,sound,be,become等后面，常用虚拟语气，表示不存在的动作或状态.,that,固定结构：Thereasonisthat+从句It/This/Thatisbecause从句Thatiswhy.,+原因,+结果,主语从句:,1._hecomeornotisnotyetknown.2.Thattheearthturnsaroundthesunisknowntous.3.Whatweneedismorepractice.4.Wherehehasbeenisstillapuzzle.5.Itisstillaproblemwhenweshallmeetourparents.,Whether,注意:1.what与that在引导名词性从句时的区别.2.由连接词或连接副词引导的主语从句，可以直接放在句首做主语，也可以被放到句子后面去，前面用it作形式主语，这两种结构可互换，意义无差别.,注意：1.常放在fact,news,idea,truth,hope,problem,information,suggestion,proposal,demand等名词后面，说明该名词的具体内容。2.demand,proposal,suggestion等名词后的同位语要用虚拟语气，形式为“should+动词原形”或省略should。3.区分同位语从句和定语从句,同位语从句：,1.Hemadeapromisethathewilllendussomemoney.2.Haveyouheardthenewsthatthenewschoolwillbebuiltinthecountryside?3.Thesuggestionthatanotherbridge(should)bebuiltoverSonghuaRiv