定语从句as 和which 的区别讲义

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1、名词性从句区别名词性从句是一种具有名词功能的非独立分句，可以表示：事实和问题。1.连接词有：thatwhether和lf2.连接代词有：whowhomwhosewhichwhat等3.连接副词有：whenwherewhyhow等另外whateverwhoeverwhichever等也可以引导主语和宾语两种从句名词性从句中的“that”没有词义，也不作任何成分。除引导宾从外，主从和表从中不省1.主语从句：从句在句中充当主语成分1)Thattheearthisroundistrue.2)Whetherhew

2、illcomeisdoubtful.3)Whathesaidsurprisedmemost.4)Wherehehidthemoneyistobefoundout.5)Whoevercomesiswelcome.6)It’scertainthathewillsucceed7)Howwecanhelpthetwinswillbediscussedatthemeeting.8)Whenthey’llstarttheprojecthasnotbeendecidedyetIt的用法：（形式主语）It’possib

3、le/important/necessary/clear…that……很可能/重要的是…/必要的是…/很清楚…It’said/reported…that…据说/据报道…It’sbeenannounced/declaredthat…已经通知/宣布…Itseems/appears/happens..that…显然、明显、碰巧…It’snowonderthat…并不奇怪/无疑…It’sapity/afact/acommonknowledge(众所周知）/acommonsaying….（俗话说“if”不能引导主

4、语从句，应有“whether”引导主语从句的“that”一般不能省。“what”引导主语从句时，谓语动词：1）常与其后作表语的名词一致2）根据句子的语境而定。1.Whatyouleftareonlyseveraloldbooks.2.Whatyousaidisofgreatimportance.3.Whathesaysanddoesdoesn’tconcernme.4.Whathesaysanddoesdon’tagree2.宾语从句：从句在句中充当宾语成分（可以作谓语动词、介词、不定式等非谓语动词的宾

5、语）that,whether，if（that常可省略）连词：who,what,which,whoever,whateverwhen,where,why,how1).CanyoumakesurewhereAlicehasputthegoldring.2).Italldependsonwhethertheywillsupportus.3).Shewillgivewhoeverneedshelpawarm6support.4).Hemadeitcleartothepublicthathedidanimport

6、antandnecessaryjob.5).Ifinditnecessarythatweshoulddothehomework.3.表语从句：从句在句中充当表语成分，一般放在连系动词之后.作用：对主语进行解释说明。连接词：that/whether/asif/asthough（if不引导表语从句)连接代词：who/whoever/which/whatever连接副词：when/where/why/how/becausee.g.Chinaisnolongerwhatsheusedtobe.That’sbec

7、ausewewereinneedofmoneyatthattime.Helookedasifhewasgoingtocry.Tomorrowiswhenitwouldbemostconvenient.1.在表语从句中，表“是否”时，只能用“whether”不能用“If”。2.一般情况下，“that”不能省。3.Itis/wasbecause….Itis/waswhy….3.Thereason(why…/for…)is/wasthat….4Thereasonisbecause/why…4同位语从句：从句在

8、句中充当同位语成分，一般跟在一些抽象名词（idea；belief；fact；truth；rumour；news等）后面，对名词作进一步解释说明同位语从句常用that/whether引导或连接副词when/where/why/how1)Theideathatcomputerscanrecognizehumanvoicessurprisesmanypeople.2)WordcamethatNapoleonhimselfwascomingtoin