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GRAMMAR名词性从句1.Itisknowntousthatheisafamoussinger.2.Thethoughtthatwemightsucceedexcitedus.3.Whathesaidiscorrect.4.Ibelieveitthatheishonest.5.Thequestionishowhedidit.6.Iamgladthatshewillcome.1、注意that的用法一.主语从句、表语从句、同位语从句中用的that不能省略。ThattheyaregoodatEnglishisknowntousall.二.宾语从句中的连接词that有时可省有时又不可省，在以下几种情况中that不能省略：１当that宾语从句中间有插入词语,that不可省Hejudgedthat,becausehewasachild,hedidnotunderstandwhathehadsaid.２当that从句有并列从句时，that不能省；Everyoneknewwhathappenedandthatshewasworried.３当多个that从句作并列宾语时,前面从句的that可省可不省,但最后一个that不可以省Heknows(that)hisEnglishteacherisfromEnglandandthatshehastwochildren.４当that作介词宾语时，that不可省掉。如：Thereasonliesinthatsheworksharderthantheothersdo2.注意同位语从句和定语从句的区别：A.定语从句中关系词代替先行词在从句中做成分;而在同位语从句中连接词不做成分。B.定语从句是对前面名词进行修饰,同位语从句是对前面的名词进行解释说明。1Thenewsthatourteamhaswonthefinalmatchisencouraging.2Thenewsthatyoutoldusisreallyencouraging.3、whether和if的用法①whether可用于介词之后.Italldependsonwhethertheywillcomeback②whether可用于不定式之前Ihavenotdecidedwhethertogoornot.③后面直接跟ornot时用whether。..Ididn’tknowwhetherornothehadarrivedinWuhan④主语从句，表语从句，同位语从句句首中只能用whether，宾语从句中则两者都可Whetherthemeetingwillbeputoffhasnotbeendecidedyet.⑤whether可引导一个让步状语从句表示“不管”、“无论”，而if不能。If表示“如果”时，不能用whether。Whetherhecomesornot,wewillbeginourpartyontime.IfIhaveenoughtime,Iwillplayfootball.4、what\who\which+ever和nomatter+what\who\which的区别：①what\who\which+ever可引导名词性从句和让步状语从句Whoeverbreakstherulemustbepunished.Whateveryoudo,youmustdoitwell.②nomatter+what\who\which只能引导让步状语从句。如：Nomatterwhobreakstherule,hemustbepunished.5、名词性从句中主句和从句的时态一致、主谓一致、语序(1)一个主语从句做主语，谓语动词常用单数：如果由and连接两个或两个以上的主语从句做主语时，谓语动词用复数；(2)由两个或多个连接词引导一个主语从句，谓语动词用单数。如：Whenthemeetingwillbegin_____notbeendecidedyet.Whentheywillstartandwheretheygo___notbeendecidedyet.Whenandwherethemeetingwillbegin___notbeendecided.hashavehas宾语从句中主句和从句的时态保持一致，但如果从句中表示提示的是客观现象，虽然主句是过去时态，从句仍用一般现在时。如：Theteachertoldusthatlighttravelsataveryhighspeed.名词性从句在句中要用陈述句语序。如：Heaskedmewhereweshouldmeet.6.关于doubt•肯定句中doubt后跟if/whether，否定句中doubt后面跟that.sb.doubtsif/whether…..sb.doesn’tdoubtthat…….Thereisnodoubtthat…….Thereisnodoubtthathewillwinthegame.