高中英语 必修3 名词性从句

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.MrsBlackwon’tbelievethathersonhasbecomeathief.•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,whythat,whether/if,asifwho,whom,whose,which,what1Ithink(that)he’llbeallrightinafewdays.2HetoldmewhatIshouldread.3Payattentiontowhattheteachersaid.4Wecametowherehelived.5Hehasmadeitclearthathewillnotgivein.6Idon’tdoubt_____hecanspeakEnglish.7Idon’tthinkthisdressfitsyouwell.宾语从句：that用if和whether填空•Iwonder______itisbigenoughornot.•Ihaven’tsettledthequestionof______I’llgobackhome.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whetherwhether1.Thequestioniswhetherthatmanwillturnupintime.2.Tomisnolongerwhatheusedtobe.3.That’swhereIcan’tagreewithyou.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)bebuiltoverSonghuaRiverwillbediscussedtomorrow.Wearegladatthenewsthathewillcome.Wearegladatthenewsthathetoldus.同定