which与as引导非限制性定语从句的异同.doc

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 The meeting was put off, as /which was exactly what we wanted. He was a doctor, as/which I knew from his manner.二． 不同点1. as可指其前后主句提到的事实或情况，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As is known to all, fish can't live without water.Air, as we know, is gas.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She told me she won the match , which was a lie.The material is elastic, as (was) shown in the figure.3. which 在非限制性定语从句做主语时可用各类动词做谓语；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。

He saw the girl, which delighted him.He didn't say anything at the meeting , as/which seemed very strange.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 whichShe has married again, as was expected.He broke the rules again, which was unexpected.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as we know （众所周知）as often happens（正 如常发生的那样）as is often the cas（情况常常如此）as we all can see（ 正 如 我 们 看 到 的 ）be+announced/expected/known/imagined/mentioned/said/shown/reported（正如所这些结构常放句首,偶尔也可以放句中或句末As is known to all, China is a developing country.Kate was late for school , as often happened.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whichMy brother enjoyed playing basketball , which he really plays well.Beijing , which he was born in, is our capital.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 whichThe Travel Agency, with which our company has been dealing for several years, has opened for new branchesAir is a mixture of gases, of which oxgen forms 21 percent.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Ten years of hard work changed her greatly , for which reason he could hardly recognise her at first sight.The machine may be out of order , in which case it will be repaired at once.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 whichHe can write a letter in English, which I can not.Metal will bear beating with a hammer, which a stone willl not10. 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 whichHe said he had passed the exam , which was untrue.1. The owner of the cinema needed to make a lot of improvements andemploy more people to keep it running , meant spending tens ofthousands of pounds.A.who B.that C.as D.which2. Jim passed the driving test, surprised everybody in the office.A.which B.that C.this D.it3. The road conditions there turned out be very good, was more than we could expect.A.it B.what C.which .that4. Mark was a student at this university from 1999 to 2003, he studiedvery hard was made Chairman of the Studen'tsUnion.A.during which time B.for which time .during whose time D.by that time5. The Science Museum , we visited during a recent trip to Britain ,is one of London's tourist attractions. A.which B.what C.tha tD.where6. The Beatles, many of you are old enough to remember, came fromLiverpool.A.what B.that C.how D.as7. I expained on the phone , your request will be considered at thenext meeting.A.When B.After C.Wha tD.Since8. ___is often the case, we have worked out the production plan. A.Which B.When C.What D.As9. has been announced , we shall have our final exams next month.A.That B.As C.It D.What10. is reported in the newspaper, talks between the two countries aremaking progress.A.It B.As C.That D.WhatDACAADCDBB。