what名词性从句用法

what当what用作连接代词，引导名词性从句时，可引导主语从句、表语从句和宾语从句；它本身在从句中充当主语、宾语或表语。1.what表示“所以……的（事）”的意思，相当于“thething(s)that…；allthat…；；everythingthat…；等。例如：1)LeaveitwithmeandI‘llseewhatIcando.(what引导宾语从句并作do的宾语)2)Whatyouhavedonemightdoharmtootherpeople.(what引导主语从句并在从句中作宾语)2.What表示“所……的(人)”意思，相当于“thepersonthat…”等。例如：1)Heisnotwhatheusedtobe.他已不是从前的他了。(what引导表语从句并在从句中作表语)2)Sheisnolongerwhatshewasfiveyearsago.(what引导表语从句并在从句中作表语)一.引导主语从句1)Whatweneedismoretime.(what做need的宾语)2)Whatreallymattersisthatsheworeapairofwhiteshoes.(what做matters的主语)3)Whathesaidatthemeetingastonishedeverybodypresent.4)Whatismostimportantinlifeisn’tmoney.6)Whathewantedtoseewasanendtoallthearmiesoftheworld.二.引导宾语从句1)Peoplewereperhapsmorehonestalongtimeagowhenlifewasverydifferentfromwhatitistoday.(what做从句中is的表语)2)PeoplehaveheardwhatthePresidenthassaid;theyarewaitingtoseewhathewilldo.(what分别做动词heard和see的宾语)三.引导表语从句1)Whetherwayswillbefoundtostoppollutionornotisjustwhatworriesthepublic.(what做从句中的主语)2)ThatiswhatIwanttotellyou.(what做从句中的宾语).3)Thelittlegirlisnolongerwhatsheusedtobe.(what做从句中的表语)四.引导同位语从句1)Theyhavenoideaatallwhatheisworkingon.(what做从句的宾语).2)YouhavenoideawhatIsuffered.(what做从句的宾语)what常用来引导名词性从句，即主语从句，宾语从句，表语从句和同位语从句.what在引导名词性从句时有两个重要的特点：一是它在相应的名词性从句中一定有含义，常表示“什么”，“所…的”，“…的样子”等.二是它在相应的名词性从句中一定做成分，而且常做主语，宾语或表语.补充：关系型what引导名词性从句的五种用法一、用法归纳1.表示“……的东西或事情”：They’vedonewhattheycantohelpher.他们已经尽力帮助了她。Hesaveswhatheearns.他赚多少，积蓄多少。WhatMaryisisthesecretary.玛丽的职务是秘书。2.表示“……的人或的样子”：Heisnolongerwhathewas.他已经不是以前的那个样子。Heiswhatisgenerallycalledatraitor.他就是人们通常所说的叛徒。WhoisitthathasmadeFredwhatheisnow?是谁把弗雷德培养成现在这个样子的？3.表示“……的数量或数目”：Ourincomeisnowdoublewhatitwastenyearsago.我们现在的收入是10年前的两倍。Thenumberofthestudentsinourschoolistentimeswhatitwasbeforeliberation.现在我校学生的数量是解放前的10倍。4.表示“……的时间”：Afterwhatseemedlikehourshecameoutwithabittersmile.似乎过了几个小时他才苦笑着出来。Theyounggirlwastoofrightenedtospeak,standingthereforwhatseemedlikehours.小女孩吓得不敢说话，在那儿站了几个小时。5.表示“……的地方”：ThisiswhattheycallSaltLakeCity.这就是他们称为盐湖城的地方。In1492,ColumbusreachedwhatisnowcalledAmerica.1492年哥伦布到达了现在所称的美洲大陆。二、that当that用作连接词，引导名词性从句时，可引导主语从句、表语从句、宾语从句和同位语从句，that在从句中既不充当任何成分，也无实际意义，仅起着连接句子的作用。一般不可省略（宾语从句除外）。若从句置于句子后面，代词it作形式主语。例如：1)Itworriedherabitthatherhairwasturninggrey.(that引导主语从句)2)ItisafactthatTheDiaoyuIslandsaresacredChineseterritory(that引导主语从句)3)Canyoubelieve(that)insucharichcountrythereshouldbesomanypoorpeople?(that引导宾语从句)4)Tomfeltthathekneweverybody’sbusinessbetterthantheyknewitthemselves.(that引导宾语从句)5)Weheardthenewsthatourteamhadwon.(that引导同位语从句)6)Anotherproblemisthatgoodsoilisgraduallylost.(that引导表语从句)7)Butthetruthisthateveryoneshouldtakecareofdisabledpeople,notjustthegovernment.(that引导表语从句)