英语 名词性从句

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1、*名词性从句的概念及分类名词性从句的功能相当于名词词组，它在复合句中能担任主语、宾语、表语、同位语等。因此根据它在句中不同的句法功能，名词性从句又分主语从句、宾语从句、表语从句和同位语从句。*引导名词性从句的连接词引导名词性从句的连接词可分为三类：从属连词：____（不充当从句的任何成分）连接代词：what、whatever、who、whoever、whom、whomever、whose、which、whichever连接副词：等★不可省略的连词：1.介词后的连词2.引导主语从句和同位语从句的连词*名词性从句的重难点一、名词性从句的语序（语序）二、名词性从句引导词间的区别1、whether

2、与if的区别whether与if均为“是否”的意思。但在以下情况下，whether不能被if取代：⑴whether引导表语从句和同位语从句时⑵在主语从句中，若用it做形式主语，if/whether均可；否则，只用whetherEg.Whetherwewillattendthemeetinghasn’tbeendecidedIthasn’tbeendecidedwhether/ifwewillattendthemeeting.⑶引导介词后的宾语从句时⑷后面跟ornot时⑸后面直接跟动词不定式时Italldependsontheywillsupportus.Hedoesn’tknowtosta

3、yornot.Whether与if均可使用的情况⑴引导宾语从句⑵在be+adj.之后Hewasnotsurewhether/ifitisrightornot.2、what与that的区别⑴that引导名词性从句，不在从句中充当任何成分，只起连接作用；what是连接代词，在从句中充当成分作主语、宾语或表语。除表明具体的内容外，还表……的时间、地点、人、速度等。①madetheschoolproudwasmorethan90%ofthestudentshadbeenadmittedtokeyuniversities.A.What;becauseB.What.thatC.That;whatD.T

4、hat;because②----Ithinkit’sgoingtobeabigproblem.----Yes,itcouldbe.----Iwonderwecandoaboutit.A.    ifB.howC.whatD.thatAmoderncityhasbeensetupinwasawastelandtenyearsago.Afterseemedalongtime,hemanagedtoworkoutthisproblem.⑵介词后的宾语从句常用what引导，不用that引导。但在介词besides,except,in后可用that引导宾语从句。由it做形式宾语时，that引导的宾语

5、从句中，that不可省略。①Criticismandself-Criticismisnecessaryinthatithelpsustocorrectourmistakes.②Henoticedthatthestraightpartofthedancewasdifferentintheafternoonfromithadbeeninthemorning.③Thesuitfittedhimwellthecolorwasalittlebrighter.A.exceptforB.exceptthatC.exceptwhenD.besides⑶what/whatever---the+n.+that

6、/which(what/whatever可作前置定语)Pleasegivemewhatbooksyouhave.Youcanwriteaboutwhatevertopicyouprefer.3、wh-ever与nomatter+疑问词的区别wh-ever既可引导名词性从句又可引导让步状语从句；而nomatter+疑问词只可引导让步状语从句。WhateverIsaid,hewouldn’tlistentome.=NomatterwhatIsaid,hewouldn’tlistentome.从句HewouldbelievewhateverIsaid.从句三、宾语从句的注意点⑴否定前移think

7、,believe,suppose,expect,guess,imagineetc.⑵若主语的谓语动词是make,find,see等，则把宾语从句置于宾补后，用it做形式主语.Theteachermadeitarulethatweshouldgetupearly.Seetoitthatchildrendon’tcatchcold.⑵that在主语从句、表语从句和同位语从句中不可省略。在宾语从句和it做形式主语的主语从句中可