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1、2019年高考英语语法必考考点（13）：名词性从句含解析李仕才【考点解读】一、名词性从句的种类名词性从句包括主语从句、宾语从句、表语从句、同位语从句。二、引导名词性从句的连接词1．连接代词：who,whose,whom,what,which有词义，在从句中担任成分，如主语、表语、宾语或定语等。Ithasnotbeendecidedyetwhenwewillleave.Weareworryingaboutwhatweshoulddonext.2．连接副词：when,where,why,how有词义，在从句中担任成分，作状语。Itmakesnodifferencew
2、hereweshallhavethemeeting.Scientistsstudyhowhumanbrainsworktomakecomputers.(2012·四川高考)3．连接词：whether,if,asif,if(whether),asif虽有词义，但在从句中不充当任何成分，只起连接作用；that无词义，在从句中也不充当任何成分，只起连接作用，有时可省略。Mysuggestionisthatwe(should)haveadiscussionaboutthismatter.Thequestionwhetherweneedmoretimetodothewor
3、khasn’tbeendiscussed.三、that,what引导的名词性从句的区别引导名词性从句时，that没有词义，在从句中不作任何成分。当从句意义完整，不缺任何成分时，往往选用that；而what引导名词性从句时，意为“什么”或“……的”，在从句中用来作主语、表语或宾语。Whatwasmostimportanttoher,shetoldme,washerfamily.(主语从句；what作主语)Beforethesalesstart,Imakealistofwhatmykidswillneedforthecomingseason.(宾语从句；what作宾
4、语)Asanewgraduate,hedoesn’tknowwhatittakestostartabusinesshere.(宾语从句；what作宾语)Chinaisnolongerwhatsheusedtobe.(表语从句；what作表语)Itneveroccurredtomethatyoucouldsucceedinpersuadinghimtochangehismind.(主语从句)Onereasonforherpreferenceforcitylifeisthatshecanhaveeasyaccesstoplaceslikeshopsandrestau
5、rants.(表语从句)【点睛】 (1)that引导主语从句时，常用it作形式主语，常见句型有：①it＋be＋形容词(如：obvious,true,natural,surprising,good,wonderful,funny,possible,likely,certain,probable,evident,clear,apparent等)＋that从句。Isittruethatthescientistwillgiveusalecturenextweek?②it＋be＋名词(如：nowonder,anhonour,agoodthing,apity,nosurpr
6、ise等)＋that从句。It’sagreatpitythatit’sprobablythelasttimethiswillhappen.③it＋be＋过去分词(如：said,reported,thought,estimated,expected,decided,announced,arranged,recognized等)＋that从句。Itisknowntoallthatphysicalexercisescanimproveourphysicalandmentalhealth.类似句型还有：Itcannotbedeniedthat.../Itmustbead
7、mittedthat...④it＋动词(如：seem,appear,happen,occurtosb.,doesn’tmatter,makenodifference等)＋that从句。Itdoesn’tmatterwhetheryouturnrightorleftatthecrossing—bothroadsleadtothepark.Itsuddenlyoccurredtohimthathehadlefthiskeysintheoffice.(2)that引导主语从句，置于句首时，that不能省略。Thatweareinvitedtoaconcertthise
8、veningisgood
