名词性从句的重点、难点、考点：名词性从句在功能上相当于名词名词性从句的定义:在复合句中起名词作用的从句叫名词性从句(NounClauses）。名词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、介词宾语等，因此根据它在句中不同的语法功能，名词从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。(一）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。2、连接副词：when,where,why,how。有词义，在从句中担任成分，作状语。3、连接词：that,whether,if,asif。that无词义，在从句中不担任成分，有时可省略；asif（好象）虽有词义，但在从句中不担任成分。注意：连词的选用：依据“缺什么补什么”原则确定正确的连词。如果句子中缺主语，指人用who，指物用what；如缺宾语，指人用whom，指物用what；如缺时间状语用when；地点状语用where；原因状语用why；方式状语用how；定语用what或which；什么都不缺用that。whether和if（是否），1.It’snotimmediatelyclear____thefinancialcrisiswillsoonbeover.A.sinceB.whatC.whenD.whether2.Asanewdiplomat,heoftenthinksof_____hecanreactmoreappropriatelyonsuchoccasions.A.whatB.whichC.thatD.how3.Whenasked____theyneedmost,thekidssaidtheywantedtofeelimportantandloved.\A.whatB.whyC.whomD.which4.Thelasttimewehadgreatfunwas___wewerevisitingtheWaterPark.A.whereB.howC.whenD.why5.Whynottryyourluckdowntown,Bob?That’s_____thebestjobsare.A.whereB.whatC.whenD.why6._______youdon'tlikehimisnoneofmybusiness.(上海1992)A.WhatB.WhoC.ThatD.Whether7.Goandgetyourcoat．It's____youleftit．A.whereB.thereC.herewhereD.wherethere（二）that在名词性从句中的用法that引导名词性从句不充当任何成分，没有具体意义。以下情况that不能省略：1.主、表、同从句不能省ThatIcanpaybackthehelppeoplegivememakesmehappy.Itiscertainthathewillsucceed.Theorderthatallthesoldiersshouldstaystillisgivenbythegeneral.Thefactisthathehasnotbeenseenrecently.2.宾语从句中的that一般可以省，但以下情况不能：a.并列宾语从句中第一个that可以省，后面的都不能省。Iknows(that)heisaworkerandthathelivesinShanghai.b.介词in,except后面的that不能省。Thereasonliesin______sheworksharderthanothersdo.Thehigherincometaxisharmfulin______itmaydiscouragepeoplefromtryingtoearnmore.c.主句动词后有其它从句插入，或连接词后有其它从句插入，that不能省。Hejudged______becausehewasachild,hedidn'tunderstandwhathesaid.Everyoneknows____happenedand_____shewasworried.Athat,thatB.what,thatC.what,/D.that,whatd.it做形式，that做真正的宾语引导从句，that不能省。Ithinkitdifficult____wefinishthetaskinonlyoneday.A/B.thatC.whatD.whiche.若主句的谓语动词是appear，agree，learn，suggest，observe等时，that通常不可省略。例如：Weagreedthatallthestudentsmustplanttreesinthepark.1.China’ssuccessinmanned-spacecrafttravelshows____ourcountryhasbecomeoneofthegreatestpowersinspaceresearch.A.whatB.whichC.不填D.itthat（三）、whether与if的辨用whether与if都可以引导宾语从句，常可互换。但在下列情况下用whether。a.主语从句b.表语从句c.同位语从句e.介词后的宾语从句f.后接动词不定式(whethertodosth.)g.whetherornot连在一起引导宾语从句时不用if___themeetingwillbeheldinBeijingisnotknownyet.A.WheneverB.IfC.WhetherD.That2.Atfirsthehatedthenewjobbutdecidedtogivehimselfafewmonthstosee____itgotanybetter.A.whenB.howC.whyD.if3._____we’llgocampingtomorrowdependsontheweather.A.IfB.WhetherC.ThatD.Where4.Whatthedoctorsreallydoubtis_____mymotherwillrecoverfromtheseriousdiseasesoon.(上海2001)A.whenB.howC.whetherD.why（四）名词性从句中一律使用陈序语气。e.g.Heaskedhow...
