高中英语定语从句 --- As 和which 引导定语从句精讲精练

定语从句中as和which定语从句中as和whichas和which都可以引导非限制性定语从句，先行词为整个主句或主句中的一部分内容，先行词在定语从句中作主语、宾语或表语，as 与which均不可省略，有时两者可以互换。

下面店铺为大家分享定语从句中as和which，欢迎大家参考借鉴。

只用as而不用which：一、当定语从句置于主句前面时：例：As you see, the Chinese people are hard-working. (定语从句在句首)你知道，中国人民是勤劳的。

注意下面句子的多种表达方法：众所周知，月球每月绕地球转一圈。

1.As is known to everybody, the moon travels round the earth once every month.2. The moon travels round the earth once every month, as/which is known to everybody.3. It is known to everybody that the moon travels round the earth once every month.4.What is known to everybody is that the earth travels round the earth once every month.(后两句属名词性从句范畴)二、先行词做主语且定语从句为被动语态时：此时，从句谓语通常为： be known, be said, be reported， be announced, be mentioned等。

如果从句是主动语态，一般用which 作主语。

例1：She has been absent again, as is expected.她又缺席了，这在预料之中。

例2：Tom has made rapid progress, which makes me veryhappy.汤姆进步很快，这使我很高兴。

定语从句精讲精练(一)关系代词的选用1.首先找准先行词，并弄清先行词是人还是物。

2.必须弄清先行词在从句中所作的成分，这是选择关系代词的关键。

⑴先行词指人，并在从句中作主语、宾语，关系代词用who/that; as；⑵先行词指物，并在从句中作主语、宾语，关系代词用that/which/as;⑶先行词指人、指物、并在从句中作表语，关系代词用that/as/who/which;⑷先行词指句子，并在从句中作主语、宾语、表语，关系代词用which,as；⑸先行词是“时间名词”，如在从句中作主语、宾语，关系代词用which/that/as; 作状语，用when;⑹先行词是“地点名词”，如在从句中作主语、宾语，关系代词用which/that/as; 作状语，用where;⑺先行词是reason ，如在从句中作主语、宾语，关系代词用which/that/as; 作状语，用why;⑻先行词指人、物，并在从句中作定语，用whose,指物时，可与 the＋名词＋of which互换；⑼先行词是way,manner等词，关系代词用that，in which,亦可省略；⑽关系代词前有介词时，关系代词用which(指物),who(指人)。

3.选择关系代词时应注意的几点：⑴that 不能放在介词之后作宾语， which,who则可以，如介词在句子后面时，也可用that,也可省略。

This is the room in which we lived last year.=This is the room we lived in last year.这是我们去年住过的房间。

⑵that不能引导非限定性定语从句，其它关系词可以，引导非限定性定语从句的关系代词不可省略。

We walked down the village street,where they were having market day.我们沿着村子的大街走去，村民们正在那里赶集。

高中英语一轮复习语法专题：as和which引导非限制性定语从句的区别专练一、单选题1.—Hello, is Mr. Smith in?—Sorry, there is ______person ______ you referred to in my office.A. such no; thatB. such no; whomC. no such; whoD. no such; as2.Shenzhou I, ________ many of you are old enough to remember, was launched in November, 1999.A. whatB. thatC. asD. one3.____is known to all, good friends _________ happiness and value to life.A. It; addB. As; addC. It; add upD. As; add tost night I saw a film, _____ was about the wild animals.A. whichB. thatC. whoD. whom5.（2015·浙江）Creating an atmosphere ________ employees feel part of a team is a big challenge.A. asB. whoseC. in whichD. at which6.（2015·湖南）It is a truly delightful place, ________ looks the same as it must have done 100 years ago with its winding streets and pretty cottages.A. asB. whereC. thatD. which7.The air quality in the city, ________ is shown in the report, has improved over the past two months.A. itB. thatC. whichD. as8.______ is often the case with children, Amy was better by the time the doctor arrived.A. ItB. ThatC. WhatD. As9.__________ has already been pointed out, grammar is not a set of dead rules.A. ItB. WhichC. AsD. What10.___________ is known to everyone, the moon travels round the earth once every month.A. ItB. AsC. ThatD. What11.（2015.江苏）The number of smokers, _____ is reported, has dropped by 17 percent in just one year.A. itB. whichC. whatD. as12.__________ is known to us, the PRC was founded on October 1, 1949.A. ItB. AsC. ThatD. What13.____is known to us all, April 14, 2010 was the day when Yushu earthquake happened.A. WhichB. AsC. ThatD. Who14.________ is mentioned above, the number of the students in senior school is increasing.A. WhichB. AsC. ThatD. It15.— Dad, let's go white—water rafting!— Ok. But equip yourself first. It is not such an easy job _____it looks.A. asB. whichC. thatD. what16.They have finished the work by themselves, ________ I told you.A. whatB. asC. thatD. when17.My grandfather is fond of talking about the good old days, ___ is often the case with old people.A. whichB. whenC. asD. it18._____ we all know, the Amber Room was missing.A. AsB. ItC. WhichD. That19.There is no simple answer, _____ is often the case in science.A. asB. thatC. whenD. where20.Do not talk about such things ________ you do not understand.A. thatB. whichC. asD. where21.I want to use the same tools________ used in your factory a few days ago.A. as wasB. which wereC. as wereD. which22.Due to the rising rents, the new graduate has decided to leave Beijing for his hometown, have many other classmates.A. soB. asC. whichD. nor23.He is such a person always helps others without claiming a reward, makes him popular in the community.A. that; thatB. that; whichC. which; whichD. as; which24.He is good at English, we all know.A. thatB. asC. whomD. which25.A lot of language learning, has been discovered, is happening in the first year of life, so parents should talk much to their children during that period.A. asB. itC. whichD. this二、语法填空26.The number of smokers, ________is reported, has dropped by 17 percent in just one year.27.There is no simple answer, ________ is often the case in science.28.________ was reported in the paper, no people died in the accident.29.________ is shown in the story, she is very clever.30.The sun heats the earth, ________makes it possible for plants to grow.31.Don't talk about such things________you are not sure of.32.He changed his mind again, ________ made us all angry.33.________ is often the case, she arrived at the school first.34.________ we all know, Mo Yan is a famous writer.35.There is a net bar around here, ________ I remember.答案解析部分一、单选题1.【答案】D【解析】【分析】句意：—你好，Smith先生在吗？—抱歉，在我们办公室里没有你说的这样一个人。

which与as在定语从句中的不同用法下面是小编整理的一些关于which与as在定语从句中的用法，希望帮助大家区分这两个单词。

提高英语水平。

which与as在定语从句中的不同用法一、which与as用法相同点1. as和which都能引导定语从句，并都可以在定语从句中做主语或宾语，代表前面整个句子。

例 1 He married her, as / which was natural. 他跟她结婚了，这是很自然的事。

例 2 He is honest, as we can see. 他很诚实，这一点我们看得出来。

(表示人们从日常主观常识, 经验对某一事情的看法、评价,用as为妥。

)2. 当非限定性定语从句置于句末时，as和which都可用来引导这个定语从句。

例 3 The number of senior high school students is increasing, as is mentioned above. (as引导非限定性定语从句，意思是“正如”。

此时也可以换用which引导，但意思有别，意思是：“这一点上面提到了”。

)二、which与as用法不同点(一)语义上的区别as作为关系代词仍多少保留“理由”“比较” “方式” “等同”等意义，而which没有这些意义。

因此，由as引导的定语从句通常在意义上不可与主句相悖，而且一般是肯定的，对主句意义起相辅作用，表示“正如”等意义;而which引导从句则不受此限制。

例 4 Mother treats me just like a baby，which I can’t bear. 妈妈对我就像小孩，我真受不了。

例 5 She has married again，which was unexpected. 她又结婚了，这是大家没有预料到的。

上面两句中的which都不宜用as。

但当否定的定语从句作正面理解，对主句起相辅作用而不是与其相悖时，仍可用as。

As与which引导非限定性定语从句辨析1.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(不能指代某个名词或代词)，可以放在主句前，后或中间，在从句中作主语或宾语、例如：As is known to all, he is the best student in our class. (as指代整个句子，作主语，置于句首)He opposed the idea, as could be expected. (as 指代整个句子，作主语，置于句末)As we all know, he studies very hard. (as 指代整个句子，作宾语，置于句首) Taiwan is, as you know, an inseparable part of China. (as指代整个句子，作宾语，置于句中)2.在非限制性定语从句中，which和as引导定语从句时的区别：a. which引导的从句不能放在主句前，而as引导的从句则既可以放在主句前，也可以放在主句后。

例如：As (正确)is often the case, he is absent.Which (错误)He saw the girl,as (正确)He had hoped.Which （正确）b.用能做关系代词，as和which都可以指代一个句子，但as有“正如”、“就像”之意，which则没有此含义。

He is a foreigner, as I know from his accent. (as指代一个句子，意为“正如”、“就像”)He has to work on Sunday, which he doesn’t like. (which指代一个句子，没有“正如”、“就像”)c.当从句的谓语动词是be或相当于联系动词的seem, become等时，可用as或which作主语。

但当从句的谓语是行为动词时，只能用which作主语。

掌握英语“介词+关系代词”引导定语从句的技巧定语从句是中学阶段一个较难的语法项目，同时又是高考必考热点之一。

许多学生或其他英语学习者在学习他的过程中感到困难和棘手，而“介词+关系代词”引导定语从句更是定语从句中难以掌握得了。

其实都有规律，事实上如果掌握了“介词+关系代词”引导定语从句的要领，那就不难了。

一，“关系代词”引导定语从句1.引导词在引导定语从句时，都会在从句中充当一个成份，如果是充当从句的主语，宾语，表语我们就要用关系代词引导。

这样的关系代词有who, whom, that, which, as等。

例如：1. You’re the one who set it up and you’re the one to make it stop.2. I’ve become good friends with several of the students in my school ________ I met in the English speech contest last year. 〖10湖南〗A. whoB. whereC. whenD. which〖解析〗该空引导定语从句修饰表示人的先行词the students, 且在从句中作met的宾语, 故选关系代词who, 即A项。

3. I refuse to accept the blame for something ________was someone else’s fault. 10全国ⅡBA. whoB. thatC. asD. what 不定代词something作主语, 用that引导。

4.〖09全国I〗She brought with her three friends, none of ___________ I had ever met before.A. themB. whoC. whomD. these 〖答案〗C〖考点〗考查定语从句中的非限制性定语从句。

As 的用法例1. the same… as;such…as 中的as 是一种固定结构, 和……一样……。

I have got into the same trouble as he (has.2. as可引导非限制性从句,常带有'正如'。

例1.As we know, smoking is harmful to one's health.例2.As is known, smoking is harmful to one's health.As是关系代词。

例1中的as作know的宾语;例2中,它充当从句的主语,谓语动词know要用被动式。

一、“as / which” 特殊定语从句的先行成分1. 形容词或形容词短语作先行成分, 具有形容词意义的介词短语也可以充当先行成分,如:My grandmother’s house was always of great importance to me, as my own is.在一定的语言环境里,有些名词可以具有形容词的性质。

这些名词主要是那些表示人的身份、职业、状态的名词。

值得一提的是,在这些具有形容词性质的名词之后,引导定语从句的关系代词不能用who / whom.2. 动词短语先行成分。

这种动词短语既可是限定形式也可是非限定形式。

如果是动态动词短语,它们在从句中就一般有限定或非限定形式的替代动词do和as /2.定语从句和同位语的区别1.定语从句修饰限定先行词,它与先行词是修饰关系;同位语从句说明先行词的具体内容,它与先行词是同位关系。

这句子可以是整个主句也可以只是主句中的一个从句。

有时是连续几个句子,有时甚至可以是一个完整的故事。

二、“as/which”特殊定语从句在句中的位置由于先行成分的构成成分不同,“as/which”特殊定语从句在句中的位置有以下几种情况:2.定语从句由关系代词或关系副词引导,关系词在从句中担当相应的句子成分,关系代词在从句中作宾语时经常可省略。

1. 引导限制性定语从句时，在such, as, the same后只能⽤as，其他情况⽤ which。

如： I never heard such stories as he tells. 我从未听过他讲那样的故事。

It’s the same story as I heard yesterday. 这故事跟我昨天听到的⼀样。

This is the photo which shows my house. 这张照⽚拍的是我的住宅。

2. 引导⾮限制性定语从句时，有时两者可互换。

如： I live a long way from work, as [which] you know. 我住得离⼯作单位很远，这你是知道的。

3. 但在，在以下情况引导⾮限制性定语从句时，两者不可换⽤。

如： ①当从句位于主句前⾯时，只⽤ as。

如： As is known to everybody, the moon travels round the earth once every month. ⽉球每⽉绕地球转⼀周，这是每个⼈都清楚的。

② as 引导的⾮限制性定语从句应与主句在意义上和谐⼀致，which⽆此限制： He went abroad, as [which] was expected. 他出国了，这是⼤家预料到的。

He went abroad, which was unexpected. 他出国了，这让⼤家感到很意外。

(不⽤as) ③ as 引导⾮限制性定语从句时，先⾏词通常不能是主句中某个具体的词，⽽应是整个句⼦、整个短语或某个短语推断出来的概念，⽽which 则⽆此限制。

如： The river, which flows through London, is called the Thames. 这条流经伦敦的河叫泰晤⼠河。

(不⽤as) ④当as 引导⾮限制性定语从句作主语时，其谓语通常应是连系动词，⽽不宜是其他动词，⽽ which则⽆此限制： She has married again, as [which] seemed natural. 她⼜结婚了，这似乎很⾃常。

高考英语定语从句知识精讲一、关系代词引导的定语从句1、that 指人或物在从句中作主语，宾语或表语；which 指物在从句中作主语，宾语或表语（作宾语时可以省略）；who 指人在从句中作主语，宾语或表语（作宾语时可以省略）；whom 指人在从句中作宾语（作宾语时可以省略）；whose 指人或物在从句中作定语；as 指人或物在从句中作主语，宾语或表语；注意：指物时，whose+名词 = the+名词+of which 或 of which + the +名词2、as 的用法（1）常用于下列结构：such…as; so…as; the same…as;注意：the same…as 表示同一类，不同一个the same…that 表示同一个（2）as与which的区别a、位置不同as可放在主句后，主句前或主句中间；which只能放在主句后。

b、as起连接作用，表达说话人的观点、看法，并指出主句内容的根据或出处，意为“正如，正像”。

which相当于并列句，可以用and this来代替，意为“这一点，这件事’”。

注意：as常用于下列结构：as we know/ as is known to all, as we all can see, as has been said before/above, as might be excepted, as is often the case, 一般不能用which 代替as。

c、在从句中作主语时，which既可作系动词be的主语也可作实义动词的主语，而as只可作系动词be的主语。

二、只用that不用which的情况1、先行词为 all, much, everything, nothing, something, anything, nothing, none, the one等不定代词时2、先行词被only, any, few, little, no , all, just , very ,right等修饰时.3、当先行词是最高级或被形容词最高级修饰时。

which和as引导的非限制性定语从句1.which引导的非限制性定语从句既可以指整个句子内容，也可以指句子的部分内容（如单词或词组等）。

注意它在句子中的位置：只能放在主句后，不能放在主句前，只能指物。

The clock, which my grandfather bought, is still in good working order.这时钟是我祖父买的，现在还走时很准。

She changed her mind again, which made us all angry. 她又改变了主意，这使我们大家都生气了。

The weather turned out to be very good, which was more than we could expect. 天气最终转晴了，这是我们没有预料到的。

2.在as引导的非限制性定语从句中，连接代词as在句子中可以作主语、宾语或表语等，可以指人或物。

翻译为“正如……”。

as引导的定语从句位置比较灵活，既可以放在主句之后，也可以放在主句之前。

常用的结构有：as we all know; as is well known to...; as is often the case; as is said/mentioned above; as has been said before; as I told you before; as often happens; as can be seen; as is/was expected; as we expect; as I can remember等。

As we all know, no news is good news. 众所周知，没有消息就是好消息。

______ （正如我们强调的那样）many times, “serve the people” is our first policy. (stress)（湖北高考）答案：As we have stressed解析：当以整个主句作为先行词，又放在主句前时，非限定性定语从句只能由as来引导，此处非限制性定语从句应为as we have stressed，as是关系代词，在定语从句中充当stressed的宾语。

高考英语as与which引导定语从句讲解关系代词as与which引导的非限制性定语从句,其先行词都可以是整个主句,指代主句的整个意思。

下面是英语as与which引导定语从句讲解,希望对考生有帮助。

1. as引导的从句表示说话人的看法、态度、解释或评论引导定语从句时,as仍具有“正如,像,由……可知”等意思,翻译时有时可不必译出。

as定语从句常含有这些动词:see, know, hear, watch, remember, say, tell, show, expect, guess等,这类动词与as 连用几乎成了一种固定搭配。

as引导的此类从句可以置于句首、句中或句尾。

如: The famous magician Liu Qian, as we all know, is from Taiwan. 众所周知,著名魔术师刘谦是台湾人。

There is a net bar around here, as I remember. 我记得这儿附近有一家网吧。

As is often the case, girls like dolls while boys like guns. 女孩子喜欢玩具而男孩子喜欢枪,这是常见的情况。

2. which引导的从句对主句所叙述的事情进行补充说明,表明事物的状态或结果which此时指前面主句所提到的这件事,常译为“这一点,这件事”等。

这时它所引导的从句与主句之间常含有并列、因果关系。

注意,它引导的从句不像as那样位置灵活,它只能位于主句的后面。

如:He changed his mind again, which made us all angry. 他又改变了主意,这使我们大家都生气了。

She tore up my photos, which (=and that upset me.她撕碎了我的照片,这使我很不安。

3. 在从句中作定语或介词的宾语时,要用which,不用asJenny might come, in which case I'll ask her. 詹妮可能会来,要是那样的话我就去问她。

复习限制性定语从句概念引入定语从句是我们从初中学到高一，又从高一学到高二，可能是出现最频繁的语法项目，在这个单元里，我们复习一下定语从句的用法，重点复习运用限制性定语从句时的注意要点。

先看下面句子：1. I know you’re dying to hear all about my life here, so I’ve included some photos whichwill help you picture the places I talked about.2. The boys who had never come across anything like this before started jumping out of thewindows.3. We walked for two and a half hours to get there —first up a mountain to a ridge fromwhere we had fantastic views and then down a steep path to the valley below.4. The only possessions I could see were one broom, a few tin plates and cups and a coupleof jars.这些句子中斜体词部分就是定语从句，其中句1中包括两个定语从句：①which引导的修饰photos；②the places后的I talked about是省略了引导词的定语从句，修饰the places。

句2中who引导的定语从句修饰boys；句3中是where引导的定语从句修饰a ridge；句4中I could see是省略了引导词that的定语从句修饰possessions。

下面我们就来对限制性定语从句的用法进行梳理和总结。

which 与as 引导的定语从句的区别众所周知，which 与as 都可以引导定语从句，但它们有许多用法上的区别，现就此简要分析如下：一、which 与as 引导非限制性定语从句的区别：1．Which 只能放在主句后面，而as 引导的从句位置相对较灵活，可在前，可在中，也可在后。

例如：A) As he realized, I was very useful to him.( 在前)B) Air, as we know, is a gas. （在中）C) He was a foreigner,as I know from his accent.( 在后)2.在which 引导的定语从句中，谓语动词若是am, is, are 则这些系动词不能省略；而as 后面若是这种情况，则可以省略。

例如：A) He is a teacher, as (is) clear from his manner.(is 可以省略)B) He said he had never seen her before, which was not true.(was 不可省略)3.当which 引导的从句在意义上近乎并列关系时，可以用and this ，and that 代替，意思是“这件事”例如：A) He changed his mind, which(and this, and that)made me very angry. 他改变了主意，这使我很生气。

B) She has married again, which(=and this, and that)was unexpected. 出乎意料的是，她又结婚了。

而as 主要起与上下文连接的作用，表达说话人的看法、观点，并指出主句内容的出处或根据等，例如：C）Einstein, as we know, is a famous scientist. 爱因斯坦，众所周知，是位伟大的科学家。

专题八定语从句常考点定语从句是英语语法学习中的一大难关,也是高考中的常考点;主要考查引导定语从句的关系代词和关系副词的选择；非限制性定语从句特别是当先行词是整个句子时,由“介词＋关系代词”引导的定语从句等;做有关定语从句题目时,一定要将先行词还原到从句里,看其在从句部分充当什么成分;错误!关系代词和关系副词的基本用法关系代词指人指物主语宾语定语表语主语宾语定语表语that,whothat,who,whom可省whose thatthat,whichthat,which可省whose that关系副词时间地点原因when＝介词＋which where＝介词＋which why＝for which注学习定语从句时,必须加强对从句句子结构的分析,切记关系代词在定语从句中作主语、宾语、定语和表语,而关系副词在定语从句中作状语;用适当的关系代词或关系副词填空：①I still remember the day ________ we studied together.I still remember the day ________ we spent together.②This is the factory ________ he used to work.This is the factory ________ we visited yesterday.This is the factory ________ makes this kind of car.③This is the reason ________ he explained.This is the reason ________ he failed in the exam.④I don't know the way ________ he used last time.I don't know the way ________ he solved the problem last time.答案①when；that/which/不填②where；that/which/不填；that/which ③that/which/不填；why ④that/which/不填；that/in which/不填错误!介词＋关系代词介词后只能用which指物,whom 指人,不可用that;介词的选用可根据从句中相关词组确定,也可结合句意根据先行词确定;该介词也可放在从句之尾;用适当的“介词＋关系代词”填空：①He is the person ________ we should learn.②The bag ________ he put his books is lost.③The man ________ she is talking is a doctor.④The train ________ he was travelling was late.答案①from whom ②in/into which ③to/about whom ④on which错误!关系代词 as的用法用于限制性定语从句中：当先行词被so,as,such,the same所修饰时,关系代词用as指人或物,而不用which;用于非限制性定语从句中：非限制性定语从句,特别是先行词是整个主句时,由which和as引导的非限制性定语从句,是高考命题的热点;注 as引导的非限制性定语从句与which引导的非限制性定语从句的区别：as引导的非限制性定语从句可以放在主句前、插在主句中间或放在主句末尾,而which引导的非限制性定语从句只能放在主句后面；as引导的从句有“正如”之意,而which则没此意;用适当的关系词填空：①This is such a heavy bag ________ I can't carry.This is such a heavy bag ________ I can't carry it .②This is the same place ________ I visited three years ago.This is the same place ________ I worked three years ago.③He failed in the exam,________ made his father very angry.He failed in the exam,________ I had expected.④A lot of language learning, ________ has been discovered, is happening in the first year of life, so parents should talk much to their children during that period.答案①as；that ②as；where ③which；as ④as错误!并列句和非限制性定语从句的判断并列句是由两个简单句组成的,句子中间必须要有并列连词；而定语从句是由主句和从句构成的;完成下列句子：①He has two brothers,and both of ________ are workers.He has two brothers,both of ________ are workers.②China has hundreds of islands,the largest of ________ is Taiwan.China has hundreds of islands,and the largest of ________ is Taiwan.③He may not come,in ________ case we will not wait for him.He may not come and in ________ case we will not wait for him.答案①them；whom ②which；them ③which；that错误!先行词模糊化表地点的先行词模糊化在句中作状语时用关系副词where,相当于in which；在句中作主语和宾语仍用关系代词;常见的词有：point,situation,position,profession,job,case,system,scene,activity,society,culture,strategy,mode l,accident,economy,crime等；常见的表时间的词有：period,occasion,stage,interval,stay等;用适当的关系词填空：①This is one point ________ we must insist on.I have reached a point in my life ________ I am supposed to make decisions of my own.②Occasions are quite rare ________ I have the time to spend a day with my kids.答案①that/which/不填；where ②when错误!定语从句中的数要保持一致关系代词指代的是先行词,因此定语从句中的谓语在数上应与先行词保持一致;完成下列句子：①Those who ________break the law should be punished.＝Anyone who ________breakthe law should be punished.＝Whoever ________break the law should be punished.②He is one of the students who ________praised at yesterday's meeting.He is the one of the students who ________praised at yesterday's meeting.答案①break；breaks；breaks ②were；was错误!定语从句中含有插入语定语从句和先行词之间常常会有I think,you know,I believe,I thought 等插入语;做此类题目时,我们要先去除插入语,再选择正确的关系词;完成下列句子：①This is the school ________ you know I once studied.②I picked up a man ________ I thought was honest.＝I picked up a man ________ I thought to be honest.③He made a discovery,________我认为 is very important.答案①where②who；that/who/whom/不填③which I think错误!只能用that 或which的情况只用that 的场合：①当先行词既指人又指物时;②当先行词是不定代词anything,nothing,everything,all,some,little,few,much,none 或被不定代词修饰时;③当先行词被形容词最高级或序数词所修饰时;④当先行词被the only和the very所修饰时;⑤当先行词在定语从句中作表语时;⑥当要避免与疑问词which重复时;只用which 的场合：①“介词＋which”,指物;②非限制性定语从句中;③防止重复;④指人的性质身份时,而不是指人时;用适当的关系代词或关系副词填空：①He told us all ________ had happened.②This is the most interesting film________ I have ever seen.③This is the first place ________ we visited yesterday.This is the first place ________ we worked.④This is the only plant ________ grows in the area.The earth is unlikely to be the only planet ________ life has developed gradually.⑤The glasses without ________ he couldn't see clearly were lost.⑥I said nothing,________ made him angry.答案①that②that/不填③that/不填；where ④that；where ⑤which⑥which错误!关系代词whose的用法在高考中,关系代词whose的考点频繁出现;在定语从句中,作定语的关系代词用whose,在表示某物时,相当于the＋n.＋of which 或of which＋the＋n.;用适当的关系词填空：①Do you know the man in ________ car she came here②The man pulled out a gold watch,________ hands were made of small diamonds.＝The man pulled out a gold watch,the hands of ________ were made of small diamonds.＝The man pulled out a gold watch,of ________ the hands were made of small diamonds.答案①whose②whose；which；which错误!找准先行词一般说来,定语从句是跟在它所修饰的先行词之后,但有时也会出现先行词和定语从句被一个词或一个短语所分隔,或者谓语太短等情况,这时我们要根据定语从句的句意判断哪一个词是先行词;用适当的关系词填空：①I've become good friends with several of the students in my school ________ I met in the English speech contest last year.②She'll never forget her stay there ________ she found her son who had gone missing two years before.③The days are gone ________ we used the foreign oil.答案①whom/who②when③when错误!“the one＋that/which/where”和that,which,where的区别完成下列句子：①Is this the museum ________ you visited last yearIs this museum ________ you visited last year②Is this museum ________ you worked last yearIs this the museum ________ you worked last year答案①that/which/不填；the one that/which或the one②the one where/where；where/in which错误!from where和since when结构的区别完成下列句子：①They stood at the window,from ________ they could see what was happening in the street.②The book was written in 1946,since ________ the education system has witnessed great changes.答案①where②when1. 2014·江苏卷The book has helped me greatly in my daily communication, especially at work ________ a good impression is a must.A. whichB. whenC. asD. where2. 2014·江西卷Among the many dangers ________ sailors have to face, probably the greatest of all is fog.A. whichB. whatC. whereD. when3. 2014·陕西卷Please send us all the information ________ you have about the candidate for the position.A. thatB. whichC. asD. what4. 2014·重庆卷We'll reach the sales targets in a month ________ we set at the beginning of the year.A. whichB. whereC. whenD. what5. 2014·安徽卷The exact year ________ Angola and her family spent together in China was 2008.A. whenB. whereC. whyD. which6. 2013·江苏卷The president of the World Bank says he has a passion for China,________ he remembers starting as early as his childhood.A. whereB. whichC. whatD. when7. 2013·浙江卷The museum will open in the spring with an exhibition and a viewing platform________ visitors can watch the big glass houses being built.A. whatB. whereC. whenD. why8. 2013·安徽卷Mo Yan was awarded the Nobel Prize for Literature in 2012,________ made one of the Chinese people's long－held dreams come true.A. itB. thatC. whatD. which9. 2013·陕西卷________ is often the case with children,Amy was better by the time the doctor arrived.A. ItB. ThatC. WhatD. As10. 2012·江苏卷After the flooding,people were suffering in that area,________ urgently needed clean water,medicine and shelter to survive.A. whichB. whoC. whereD. what答案1. D 2. A 3. A 4. A 5. D 6. B 7. B 8. D 9. D 10. B1. Do you know the man ________A. whom I spokeB. to who I spokeC. I spoke toD. that I spoke2. I am very grateful to my high school teachers,without ________ help I wouldn't be so excellent.A. whomB. themC. whichD. whose3. —Where did you meet him while in Beijing—It was in the hotel ________ I stayed.A. thatB. whichC. whenD. where4. The settlement is home to nearly 1,000 people,many of ________ leaving their village homes for a better life in the city.A. whomB. whichC. themD. those5. The time is not far away ________ modern communications will become widespread in China's vast countryside.A. asB. whenC. untilD. before6. He talked a lot about things and persons ________ they remembered in the school.A. whichB. thatC. whomD. what7. Her sister has become a lawyer,________ she wanted to be.A. whoB. thatC. whatD. which8. I'm told that languagepractising is a free website ________ learners can not just learn various languages but also chat online.A. whereB. whichC. thatD. what9. The way ________ he looks at problems is wrong.A. whichB. whoseC. whatD. /10. By serving others,a person focuses on someone other than himself or herself,________ can be very eye－opening and rewarding.A. whoB. thatC. whichD. what11. My neighbours used to give me a hand in time of trouble,________ was very kind of them.A. whoB. whichC. thatD. it12. He's got himself into a dangerous situation ________ he is likely to lose control over the plane.A. whereB. whichC. whileD. why13. Young people who have got jobs may realize university lessons can't be the only preparation for all of the situations ________ appear in the working world.A. whereB. whenC. thatD. what14. The manager had to go to Beijing on business on June 23,________ happened to be his only son's birthday.A. whenB. thatC. whichD. what15. The picture often reminds me of the happy hours time and again ________ I was playing happily with my friends during the holidays.A. howB. thatC. whenD. where16. Nowadays teenagers like to go to fast food restaurants,________ serve junk food.A. whichB. whoC. whatD. where17. Is this research centre ________ you visited the modern equipment last yearA. whichB. thatC. the one whereD. the one that18. She is such a good teacher ________ we all love and respect.A. thatB. asC. soD. who19. The volunteers paid a visit to all the senior citizens in the community,most of ________ are aged from 70 to over 90 years old.A. whomB. thoseC. themD. which20. Last week,we watched Beijing Opera,________ style was unfamiliar to most of us.A. whatB. whichC. whereD. whose21．The school shop, ________ customers are mainly students, is closed for the holidays.A. whichB. whoseC. whenD. where22. My pen friend sent me an e－mail yesterday ________ he described how he spent his summer holiday.A. whenB. whereC. whatD. which23. Last term our English teacher set so difficult an examination problem ________ none of us worked out.A. asB. thatC. whichD. whose24. That evening, ________ I will tell you more about later, I ended up working very late.A. thatB. whichC. whatD. when25. There was a time in my life ________ I hated to go to school because I didn't get on well with my classmates.A. thatB. whenC. whatD. which26. You'll find taxis waiting at the bus station ________ you can hire to reach your host family.A. whichB. whereC. whenD. as27. Whatever is left over may be put into the refrigerator, ________ it will keep for two or three weeks.A. whenB. whichC. whereD. while28. After graduation she reached a point in her career ______ she needed to decide what to do.A. thatB. whatC. whichD. where29. Women ________ drink more than two cups of coffee a day have a greater chance of having heart disease than those ________ don't.A. who; /B. /; whoC. who; whoD. /; /30. Last month, part of Southern Asia was struck by floods, from ________ effects the people are still suffering.A. thatB. whoseC. whichD. what答案1. C 2. D 3. D 4. C 5. B 6. B 7. D 8. A9. D 10. C 11. B 12. A 13. C 14. C 15. C 16. A17. C 18. B 19. A 20. D 21. B 22. B 23. A 24. B 25. B 26. A 27. C 28. D 29. C 30. B。

As引导的定语从句（含配套练习与答案）as与which引导定语从句的用法辨析定语从句是高一英语的主要语法项目之一，也是高考英语的常考知识点，尤其是as和which 引导的定语从句，更是历年高考试题中的考点和热点。

as和which都能引导定语从句，那么它们的共同点和区别是什么呢?一、as和which都能引导的定语从句当非限定性定语从句置于句末时，as和which都可用来引导这个定语从句。

例如：Dorothy was always speaking highly of her role in the play, _______ , of course, made the others unhappy. (NMET2000)A. whoB. whichC. thisD. what【简析】答案是B。

which引导非限定性定语从句，指代前面主句的内容，定语从句部分意为：这当然使别人不高兴。

这里不能换用as 作引导词，因为我们不能说“正如使别人不高兴”。

The number of senior high school students is increasing, _______ is mentioned above.A. thatB. itC. suchD. as【简析】答案是D。

as引导非限定性定语从句，意思是“正如”。

此时也可以换用which引导，但意思有别，意为：这一点上面提到了。

二、只能用which引导的定语从句1. 在限定性定语从句中。

例如：The project _______ a British businessman has invested in isunder construction at present.A. whichB. asC. whatD. why【简析】答案是A。

单个词引导限定性定语从句时，一般不用as。

当然，本题中的定语从句也可以使用that引导；由于关系词在从句中作宾语，which和that都可以省略。

教学过程一、复习预习1.关系代词的种类：关系代词: that, which, who, whose,关系副词: when, where, why2. He talked about the schoosl and the teachers _______he had visited .A. thatB. whichC.whoD. whom3. He talked about the schoosl and the teachers _______he had visited .A. thatB. whichC.whoD. whom4.Thelost their way in the forest ,_______made matters worse .A. thatB. whichC.whereD. when5. This is the house where he has lived for 20 years .6. This is the house that he has lived in for 20 years .二、知识讲解知识点1：非限制性定语从句1.关系代词在非限定性定语从句中的用法。

指人做主语用who,作宾语用whom ，指地点用where，指时间when，指物只用which，不能用that，作定语用whose。

e.g. He didn’t see the film, which was very interesting .(不用that)2.as 引导的非限制性定语从句as 可以像which一样引导非限制性定语从句，用来代表整个句子的内容，它的先行词可以是名词，也可以是不定式短语或整个句子。

as 在从句中作主语、宾语和表语。

此外，有些as 引导的定语从句已成为固定用法，如：As we know As has been said before 如上所述As is known to all As is often the case 像通常那样As is reported As was expected 正如预料的那样Eg：She is very careful, as her work shows.As we know, smoking is harmful to one’s health.As is often the case, we have worked out the production plan.3.重点比较as 和which 引导的非限制性定语从句的联系和区别➢as 和which 都可以代替整个句子，当定语从句置于主句之后时，as和which可以和互换。