专题07as与which引导非限制性定语从句【理论回顾】一、as引导非限制性定语从句as引导非限制性定语从句，只代表主语或主句的一部分所表达的意思(_________________________________)，可以放在主句前，后或中间，在从句中作主语或宾语。例如：Asisknowntoall,heisthebeststudentinourclass.(as指代整个句子，作主语，置于句首)Heopposedtheidea,ascouldbeexpected.(as指代整个句子，作主语，置于句末)Asweallknow,hestudiesveryhard.(as指代整个句子，作宾语，置于句首)Taiwanis,asyouknow,aninseparablepartofChina.(as指代整个句子，作宾语，置于句中)二、as与which引导非限制性定语从句的相同点两者引导非限制性定语从句时，可指代主句中的部分或整个句子的内容，在从句中做______________________，位于主句之后有时可互换。Themeetingwasputoff,as/whichwasexactlywhatwewanted.Hewasadoctor,as/whichIknewfromhismanner.三、as与which引导非限制性定语从句的不同点1.as可以放在主句前后，也可插入主句之中；而which引导的非限制性从句只能位于___________。Asisknowntoall,fishcan’tlivewithoutwater.Air,asweknow,isgas.2.在非限制性从句中，which后的be动词不可省；as而后的be动词_____省略。Shetoldmeshewonthematch,whichwasalie.Thematerialiselastic,as(was)showninthefigure.3.which在非限制性定语从句做主语时可用___________做谓语；而as做主语时，谓语常用___________，如be,seem,become等，一般不用其他行为动词。Hesawthegirl,whichdelightedhim.Hedidn’tsayanythingatthemeeting,as/whichseemedverystrange.4.as“”常用正如含义，常用的结构有asweknow（众所周知）；asoftenhappens（_______________）；asisoftenthecase（_______________）;asweallcansee（______________）等。这些结构常放句首，偶尔也可以放句中或句末。Asisknowntoall,Chinaisadevelopingcountry.Katewaslateforschool,asoftenhappened.5.在非限制性定语从句中which指代主句中___________时，as不可以。Mybrotherenjoyedplayingbasketball,whichhereallyplayswell.Beijing,whichhewasbornin,isourcapital.6.“介词+”关系代词（介宾代物）中关系代词只能用___________。TheTravelAgency,withwhichourcompanyhasbeendealingforseveralyears,hasopenedfornewbranches.Airisamixtureofgases,ofwhichoxygenforms21percent.7.从句中的谓语动词是___________时，常用which。HecanwritealetterinEnglish,whichIcannot.Metalwillbearbeatingwithahammer,whichastonewillnot8.在非限制性定语从句关系代词代表前面主句中的___________时，常用whichHesaidhehadpassedtheexam,whichwasuntrue.【想一想】例1：Davidissuchagoodboy_______alltheteacherslike.A.thatB.whoC.asD.whom例2：Davidissuchagoodboy_______alltheteacherslikehim.A.thatB.whoC.asD.whom例3：Itwasnotsuchagooddinner_______shehadpromisedus.A.likeB.thatC.whichD.as【练一练】一、判断下列句子中as和which能否互换1.Hemarriedher,aswasnatural.________________________________________________________________2.Themeetingwasputoff,whichwasexactlywhatwewanted.________________________________________________________________3.Heishonest,aswecansee.________________________________________________________________4.Hewasadoctor,asIknewfromhismanner.________________________________________________________________5.Asisknowntoall,fishcan’tlivewithoutwater.________________________________________________________________二、选择题1._____isknowntoeverybody,themoontravelsroundtheearthonceeverymonth.A.ItB.AsC.ThatD.What2._______isknowntoeverybodythatthemoontravelsroundtheearthonceeverymonth.A.ItB.AsC.ThatD.What3._________ismentionedabove,thenumberofthestudentsinseniorschoolisincreasing.A.WhichB.AsC.ThatD.It4.________ismentionedabovethatthenumberofthestudentsins...
