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1、1）关系代词在非限定性定语从句中代替主句中某一个名词或词组，并对该名词或词组进行补充或说明时，只能用which.Thebook,whichIboughtyesterday,isveryinteresting.Lastnight,Isawafilm,whichwasaboutLongMarch.2)关系词在非限定性定语从句中代表主句中谓语部分的整个概念的只能用which.HecanwritealetterinEnglish,whichIcannot.Iaskedhimtolendmehisbike,whic
2、hhedid.3)关系词在非限制性定从中代表主句所表达的整个内容，并当关系词等于andthis时，只能用which.Thestemsofbambooarehollow,whichmakesthemverylight.Itwasraininghard,whichkeptusindoors.4)关系词在非限制性定从中代表主句所表达的整个内容,并关系词等于whichfact时，只能用asThiselephantislikeasnake,asanybodycansee.Hecameveryearlythismor
3、ning,aswasusual.5)关系代词所引导的非限定性定从放在主句之前时，只能用as.Asweallknow,TaiwanisapartofChina.6)非限定性定从的谓语为say,know,imagine,announce,show,report,expect,explain,pointout等动词的被动形式时，只能用as.Heisafamousscientist,asiswellknown.Asisannouncedintoday’snewspaper,Americanpresidentwil
4、lpayavisittoChina.7)关系词在非限定性定从中代表主句中的表语意思，并在从句中作表语时，只能用as.Thisquestionisverysimple,asindeeditis.Thisquestionisquiteeasy,asareallofthequestionsinthefollowing.8)如果定语从句的内容对主句有消极作用 或含义不一致，则从句用which引导，如果语义一致时，则常用as引导。Shedidnothingbutsitthere,whichshowedherlazi
5、ness.Ourteamlostthegameatlast,whichmadeusdisappointed.9)从句中的谓语是复合结构时，用which引导。Bobalwaystellsalie,whichhisparentsfindstrange.10)从句是否定结构时，多用which.MrSmithoftenpraisedhisstudentRoseinpublic,whichshedidn’tlikeall.11)在从句中作主语时，as多用于被动语态，which多用于主动语态。Hehasbeenlat
6、eagain,asisexpected./Allenhasmadegreatprogress,whichdelightedus.练习：1．Dorothywasalwaysspeakinghighlyofherroleintheplay，_____，ofcourse，madetheothersunhappy．（NMET2000）A．whoB．whichC．thisD．that2．Theweatherturnedouttobeverygood，_____wasmorethanwecouldexpect．A．w
7、hatB．whichC．thatD．it3．IntheofficeIneverseemtohavetimeuntilafter5：30P.M._____manypeoplehavegothome．（上海95）A．whosetimeB．thatC．onwhichD．bywhich34．_____，theGreatWallcameintobeinginQinDynasty．A．It'sclearB．WeallknowC．AsweallknowD．Whichweallknow5．Asmanymemberswer
8、epresent_____agreedtotheplan．A．whoB．thatC．whichD．as6．_____isknowntoeverybody，themoontrav-elsroundtheearthonceeverymonth．（NMET2001）A．ItB．AsC．ThatD．What（参考答案：1．B2．B3．D4．C5．D6．B）16．MissGreentookupthestoryatthepoint____
