which与as引导非限制性定语从句的异同

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1、which与as引导非限制性定语从句的异同which与as一样，都可以引导非限制性定语从句，它们既有相同之处，也有差别。因此在实际运用中容易混淆。它们的某些用法在高考中也会考查。一．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，在从句中做主语，宾语或表语，位于主句之后有时可互换。Themeetingwasputoff,as/whichwasexactlywhatwewanted.Hewasadoctor,as/whichIknewfromhismanner.二．不同点1.as可指其前后主句提到的事实或情况，

2、因此引导的非限制性从句位置比较灵活，which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主句之后。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动词可以省略。Shetoldmeshewonthematch,whichwasalie.Thematerialiselastic,as(was)showninthefigure.3.which在非限制性定语从句做主语时可用

3、各类动词做谓语；而在非限制性定语从句做主语时，谓语常用连系动词，如be,seem,become等，一般不用其他行为动词。Hesawthegirl,whichdelightedhim.Hedidn’tsayanythingatthemeeting,as/whichseemedverystrange.4.如果主句中叙述的事情与从句所涉及的意向一致，多用as，用以对主句的意义进行补充；如果不一致，就用whichShehasmarriedagain,aswasexpected.Hebroketherulesagain,whichwasune

4、xpected.5.如表示“如同。。。那样，按照，正如”含义，常用as，这里as主要起与上下文联系的作用，表达说话人的看法，并指出内容，出处和根据等，常用的结构有asweknow（众所周知）asoftenhappens（正如常发生的那样）asisoftenthecase（情况常常如此）asweallcansee（正如我们看到的）be+announced/expected/known/imagined/mentioned/said/shown/reported（正如所。。。）等。这些结构常放句首，偶尔也可以放句中或句末Asisknow

5、ntoall,Chinaisadevelopingcountry.Katewaslateforschool,asoftenhappened.6.在非限制性定语从句中关系代词指代主句中某一个单词时，常用whichMybrotherenjoyedplayingbasketball,whichhereallyplayswell.Beijing,whichhewasbornin,isourcapital.7.在非限制性定语从句中“介词+关系代词（介宾代物）”中关系代词只能用whichTheTravelAgency,withwhichourc

6、ompanyhasbeendealingforseveralyears,hasopenedfornewbranchesAirisamixtureofgases,ofwhichoxgenforms21percent.8.有时用case,point,time,situation或reason等抽象名词来总结主句的内容，可用“介词+which+抽象名词”构成从句Tenyearsofhardworkchangedhergreatly,forwhichreasonhecouldhardlyrecogniseheratfirstsight.Th

7、emachinemaybeoutoforder,inwhichcaseitwillberepairedatonce.9.在非限制性定语从句关系代词用以代表主句中谓语的整个概念，从句中的谓语动词是否定形式时，常用whichHecanwritealetterinEnglish,whichIcannot.Metalwillbearbeatingwithahammer,whichastonewilllnot10.在非限制性定语从句关系代词代表前面主句中的宾语从句时，常用whichHesaidhehadpassedtheexam,whichw

8、asuntrue.1.Theownerofthecinemaneededtomakealotofimprovementsandemploymorepeopletokeepitrunning,____meantspendingtenso