详细的定语从句讲解

内容提要定语从句是由关系代词和关系副词引导的从句，其作用是作定语修饰主句的某个成分，定语从句分为限定性和非限定性从句两种。状语从句分为时间状语从句，结果状语从句，让步状语从句，原因状语从句，条件状语从句以及行为方式状语从句。名词从句包括主语从句，宾语从句，表语从句和同位语从句及there be句型。 一、 限定性定语从句1. that即可代表事物也可代表人，which代表事物；它们在从句中作主语或宾语，that在从句中作宾语时常可省略关系词，which在从句中作宾语则不能省略。而且，如果which在从句中作“不及物动词＋介词”的介词的宾语，注意介词不要丢掉，而且介词总是放在关系代词which的前边，但有的则放在它原来的位置 2. which作宾语时，根据先行词与定语从句之间的语义关系，先行词与which之间的介词不能丢3. 代表物时多用which，但在带有下列词的句子中用that而不用which，这些词包括all, anything, much等，这时的that常被省略 4. who和whom引导的从句用来修饰人，分别作从句中的主语和宾语，whom作宾语时，要注意它可以作动词的宾语也可以作介词的宾语 5. where是关系副词，用来表示地点的定语从句 6. when引导定语从句表示时间〔注〕值得一提的是，表示时间“time"一词的定语从句只用when引导，有时不用任何关系代词，当然也不用that引导 By the time you arrive in London, we will have stayed there for two weeks. I still remember the first time I met her. Each time he goes to besiness trip, he brings a lot of living necessities, such as towers, soap, toothbrush etc. 7. whose是关系代词，修饰名词作定语，相当于所修饰成分的前置所有格 8. 当从句的逻辑主语是some, any, no, somebody, anybody, nobody, something, anything, everything或nothing时，常用there is来引导 二、非限定性定语从句：非限定性定语从句的作用是对所修饰的成分作进一步说明，通常和主句间用逗号隔开，将从句拿掉后其他部分仍可成立 1. which引导的非限定性定语从句来说明前面整个句子的情况或主句的某一部分 2. 在引导限定性定语从句时，that有时相当于in which, at which, for which或at which Attitudes towards daydreaming are changing in much the same way that(in which) attitudes towards night dreaming have changed. 人们对白日做梦的态度正在改变，这与人们对夜间做梦的看法的变化有非常相似之处。 I like the music for the very reason that(for which) he dislike it. 我出于某种原因喜欢这种音乐，而他恰恰与我相反。 We arrived the day that(on which) they left. 刚好我们到的那天他们走了。 3. 有时as也可用作关系代词 4. 在非限定性定语从句中，不能用that，而用who, whom代表人，用which代表事物 三、定语从句结构错误 1. 缺关系词 2. 从句中缺成分摘自《简明英语语法》 在英文中，有两种定语从句：限定性定语从句与非限定性定语从句。这两种定语从句在其功能和形式方面都有明显的区别： 限定性定语从句限定性定语从句与主句的关系很紧奏，对其先行词起限定、修饰的作用。如果将其去掉，会影响句子意思的完整性；有时甚至于引起费解、误解。例如： Rainforests are being cleared for valuable timber and other resources to speed up the economic growth of the nationsin which they are located . 为了加速他们各自所在国家的经济发展，热带雨林作为有价值的原木和其他资源正为人们所砍伐。 Ocean currents affect the climates of the lands near which they flow. 洋流影响其流经的附近地区的气候。 They explained the reason to us why they had hated us before. 他们向我们解释为什么他们不喜欢我们的原因。 非限定性定语从句非限定性定语从句在形式上就与主句很松散，它与主句之间有一个逗点"，"隔开；它对其先行词没有限定、修饰的作用，只起补充、说明的作用。有时也用它来对全句进行补充、说明。即使将其去掉，也不会影响句子意思。由于上述原因，非限定性定语从句在表达意思方面也有别于限定性定语从句。另外，非限定性定语从句在中文译文里，我们往往将其作为一个分句处理，而不把它作定语翻译。 例如：Earlier , the Babylonians had attempted to map the world , but they presented it in the form of a flattened disc rather than a sphere , which was the form adopted by Ptolemy . （此句中，非限定性定语从句是对先行词a sphere进行补充、说明。） 更早之前，巴比伦人曾试图绘制世界地图，但是他们把它绘制成平盘状而不是托勒密所采用的球体状。 The combination of satellites, which transmit information , computers , which store information , and television , which displays information , will change every home into an education and entertainment center . （此句中，三个非限定性定语从句分别对三个先行词：satellites ，computers和television进行补充、说明。如果去掉这三个非限定性定语从句，那么句子可简化为： The combination of satellites , computers and television will change every home into an education and entertainment center .）卫星能传输信息，计算机能储存信息，电视能显示信息，把这些手段结合起来可以使每个家庭都成为教育娱乐的中心。 The sun heats the earth , which makes it possible for plants to grow .（此句中，非限定性定语从句是对全句进行补充、说明,将全句表达的意思看成"一件事情）。太阳给予大地热，这就使植物的生长成为可能。 The old man has a son , who is in the army .（此句中，非限定性定语从句是对先行词son进行补充、说明。但本句所传达的信息是："这位老人只有一个儿子" 。如果将此句改写成限定性定语从句： The old man has a son who is in the army . 那位老人有一个在部队工作的儿子。那么，限定性定语从句就要对先行词son进行限定、修饰。这样一来，句子所传达的信息就变成了："这位老人有一个儿子在部队工作，还有其他的儿子在干别的工作"。）那位老人有一个儿子，他在部队工作。

最好上网看，在这里贴不了多少。。。

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定语从句详解用来说明主句中某一名词或代词（有时也可说明整个主句或主句中一部分）而起定语作用的句子叫作定语从句。 一．词引导的定语从句1. 关系代词用来指代先行词是人或物的名词或代词句子成分 用于限制从句或非限制性从句 只用于限制性从句 代替人 代替物 代替人或物主语 Who which that主语 Whom which that宾语 Whose(=of whom) whose(=of which)例1：This is the detective who came from London. 例2：The book which I am reading is written by Tomas Hardy. 例3：The desk whose leg is broken is very old. 例4：This is the room that Shakespeare was born in.2．关系代词的用法 (1) 如果先行词是all, much, anything, something, nothing, everything, little, none等不定代词，关系代词一般只用that，不用which。例如： All the people that are present burst into tears. (2) 如果先等词被形容词最高级以及first, last, any, only, few, mush, no, some, very等词修饰，关系代词常用that,不用which, who，或whom。例如： (3) 非限制性定语从句中，不能用关系代词that,作宾语用的关系代词也不能省略。例如： There are about seven million people taking part in the election, most of whom、are well educated. (4) which还有一种特殊用法，它可以引导从句修饰前面的整个主句，代替主句所表示的整体概念或部分概念。在这种从句中，which可以作主语，也可以作宾语或表语，多数情况下意思是与and this 相似，并可以指人。例如： He succeeded in the competition, which made his parents very happy. (5) that可指人或物，在从句中作表语，（指人作主语时多用who）仅用于限制性定语从句中。 (6) which可作表语，既可指人，以可指物。指人时，一般指从事某种职业或是有种特征．品性或才能的人。Which引导的定语从句可以限制性的，也可以是非限制性的。 (7) 如果作先作词的集体名词着眼于集体的整体，关系代词用which;若是指集体中的各个成员，则用who。 (8) 先行词有两个，一个指人，一个指物，关系代词应该用that。例如： The boy and the dog that are in the picture are very lovely. (9) 如果先行词是anyone, anybody, everyone, everybody, someone, somebody,关系代词应该用 who 或whom，不用 which。例如： Is there anyone here who will go with you?3．“介词＋关系代词“是一个普遍使用的结构 (1) “介词＋关系代词“可以引导限制性定语从句，也可以引导非限制性定语从句。“介词＋关系代词“结构中的介词可以是 in, on, about, from, for, with, to at, of, without 等，关系代词只可用whom或 which,不可用 that 。 (2) from where为“介词＋关系副词“结构，但也可以引导定语从句。例如： We stood at the top of the hill, from where we can see the town.. (3) 像listen to, look at, depend on, pay attention to, take care of等固定短语动词，在定语从句中一般不宜将介词与动词分开。例如： This is the boy whom she has taken care of.二．关系副词引导的定语从句 1．关系副词也可以引导定语从句 关系副词在从句中分别表示时间．地点或原因。关系副词when在从句中充当时间状语，where 充当地点状语，why充当原因状语。 2. that可引导定语从句表示时间．地点或原因 That有时可以代替关系副词 when, where 或者why引导定语从句表示时间．地点或原因，在 that引导的这种定语从句中，that也可以省去。三．限制性定语从句与非限制性定语从句 1．二者差异比较 限制定语从句紧跟先行词，同先行词这间一般不加逗号，仅修饰先行词，可以由关系代词．关系副词或that来引导。非限制性定语从句仅作补充或说明，用逗号与主句隔开，既可修饰先行词，又可修饰整个主句，不可用that引导。 2．关系代词和关系副词的选择依据 (1) 弄清代替先行词的关系词在从句中作什么成分,作状语的应选用关系副词，作主语．宾语或表语的可选用关系代词。 3. 先行词与定语从句隔离 定语从句一般紧跟在先行词之后，但定语从句与先行词之间有时也会插入别的成分，构成先行词与定语从句的隔离。例如： 1) This is the article written by him that Is poke to you about.. 2) He was the only person in this country who was invited四．As在定语从句中的用法 1. 引导限制性定语从句和非限制性定语从句 （1）as多与such 或the same连用，可以代替先行词是人或物的名词。 （2）as 也可单独使用，引导非限制性定语从句，作用相当于which。例如：The elephant’s nose is like a snake, as anybody can see. 3）the same… that与 the same …as在意思上是不同的。 2．As引导的非限制性定语从句的位置 as引导的非限制性定语从句位置较灵活，可以位于主句前面．中间或后面，一般用逗号与主句隔开，但which所引导的非限制性定语从句只能放在主句之后。例如： (1) As is expected, the England team won the football match. (2) The earth runs around the sun, as is known by everyone.

其实你可以利用"百度百科"里查,更多看这里http://bk.baidu.com/view/56536.htm 定语从句是由关系代词和关系副词引导的从句，其作用是作定语修饰主句的某个名词性成分，定语从句分为限定性和非限定性从句两种。 （一） 限定性定语从句1. that即可代表事物也可代表人，which代表事物；它们在从句中作主语或宾语，that在从句中作宾语时常可省略关系词，which在从句中作宾语则不能省略。而且，如果which在从句中作“不及物动词＋介词”的介词的宾语，注意介词不要丢掉，而且介词总是放在关系代词which的前边，但有的则放在它原来的位置 2. which作宾语时，根据先行词与定语从句之间的语义关系，先行词与which之间的介词不能丢3. 代表物时多用which，但在带有下列词的句子中用that而不用which，这些词包括all, anything, much等，这时的that常被省略 4. who和whom引导的从句用来修饰人，分别作从句中的主语和宾语，whom作宾语时，要注意它可以作动词的宾语也可以作介词的宾语 5. where是关系副词，用来表示地点的定语从句 6. when引导定语从句表示时间〔注〕值得一提的是，表示时间“time"一词的定语从句只用when引导，有时不用任何关系代词，当然也不用that引导 By the time you arrive in London, we will have stayed there for two weeks. I still remember the first time I met her. Each time he goes to business trip, he brings a lot of living necessities, such as towers, soap, toothbrush etc. 7. whose是关系代词，修饰名词作定语，相当于所修饰成分的前置所有格 8. 当从句的逻辑主语是some, any, no, somebody, anybody, nobody, something, anything, everything或nothing时，常用there is来引导

定语从句 （一）定语从句一般由关系代词和关系副词引导1、关系代词：who,whom,whose,which,that,as2、关系副词：when,where,whyP.S ：关系代词和关系副词必须位于从句之首，主句先行词之后，起着连接先行词和从句的作用，同时在从句中又充当句子成分。e.g.She is the girl who sings best of all.（关系代词who在从句中作主语）The comrade with whom I came knows French.（whom在从句中作介词with的宾语）3、关系代词和关系副词的用法：1）当先行词为人时用who作主语，whom作宾语；2）当先行词为物或整个句子时用which，可作主语或宾语；3）先行词为人、物时用that，可作主语或宾语；4）whose用作定语，可指人或物；5）关系副词when（指时间，在定语从句中作时间状语，where（指地点，在定语从句中作地点状语），why（指原因，在定语从句中作原因状语）。（二）限制性定语从句与非限制性定语从句1、限制性定语从句：从句与主句关系密切，去掉从句，主句意义不完整，甚至不合逻辑。 e.g.I was the only person in our office who was invited.（去掉定语从句，意思就不完整） 2、非限制性定语从句：从句对先行词关系不密切，去掉定从句，意思仍然完整。形式上用逗号隔开，不能that用引导。 e.g.Tom’s father,who is over sixty,still works hard day and night.（who引导非限制性定语从句，整个句子可分成两句来翻译）（三）使用定语从句时特别注意的几个问题1、that与which的区别。1）用that而不用which的情况：①先行词为不定代词all,anything,nothing,…；②先行词有最高级修饰，有序数词修饰；③先行词有only,very,any等词修饰；④先行词既有人又有物时。e.g.There is nothing that can prevent him from doing it.没有什么能阻止他不干那件事。 The first place that they visited in Guilin was Elephant Trunk Hill.在桂林他们所参观的第一个地方是象鼻山。This is the best film that I have ever seen.这部电影是我看过的最好的一部。Mr Smith is the only foreigner that he knows.史密斯先生是他认识的唯一的外国人。2）用which而不用that的情况：①引导非限制性定语从句；②代表整个主句的意思；③介词+关系代词。e.g.He had failed in the maths exam,which made his father very angry.他数学考试没有及格，这使他的父亲很生气。 This is the room in which my father lived last year.这是父亲去年居住过的房子。3）as引导定语从句时的用法①as引导限制性定语从句通常用于thesame…as,such…as结构中。e.g.I want the same shirt as myfriend’s.我要一件跟我朋友一样的衬衫。Such machines as are used in our workshop are made in China.我们车间使用的这种机器是中国制造的。②as引导非限制性定语从句既可放在主句之前，也可放在主句之后，用来修饰整个句子。通常用下列句型：as is known to all,as is said,as is reported,as is announced,as we all know,as I expect等。e.g.As I expected,he got the first place again in this mid-term examination.正如我所预料的那样，他在这次期中考试中又获得了第一名。3）as引导非限制性定语从句时与which的区别①当主句和从句语义一致时，用as；反之，用which来引导非限制性定语从句。e.g.He made along speech,as we expected. He made along speech,which was unexpected.②当非限制定语从句为否定时，常用which引导。e.g.Tom drinks a lot everyday,which his wife doesn’t like at all.2.关系代词在从句中作主语时，从句的谓语动词单数还是用复数应由先行词决定。e.g.The man who lives downstairs speaks English fluently.住在楼下的那个人英语说得很流利。 The students who are in GradeThree are going to climb the hill tomorrow.3.定语从句有时不直接紧靠先行词，中间由一个定语、状语或谓语隔开。e.g.There is an expression in his eyes that I can’t understand.4.引导定语从句的关系副词有时可以用“介词+which”来代替。e.g.October 1,1949 was the day on which(=when)the People’s Republic of China was founded.5.当定语从句中谓语动词是带介词或副词的固定短语动词时，短语动词的各个固定部分不要拆开。e.g.The sick man whom she is looking after is her father.6.介词在关系代词前，只能用which和whom，且不能省略；介词在句尾，关系代词可有which,that,whom,口语中也可用who，且可省略。e.g.The man(whom/who/that)you were talking about has come to school.

句子作定语，可以理解为。。。。的所谓定语，就是修饰名词的，举个最简单的例子，i am a beautiful girl ,beautiful 就是定语了，而定语从句就是一个从句来充当 定语的成分，正如上句中beautiful 的成分

百度一下很全

定语从句，一个句子跟在一名词或代词（先行词）后进行修饰限定，就叫做定语从句。通俗来讲，从句在整个句子中做定语，这个从句就叫做定语从句。从句在主句中充当定语成分。 被修饰的词叫先行词。定语从句不同于单词作定语的情况，它通常只能放在被修饰的词（即先行词）之后。定语从句由关系词（关系代词、关系副词）引导，关系代词、关系副词位于定语从句句首。定语从句=先行词+关系词+从句扩展资料：1）who, whom, that这些词代替的先行词是人的名词或代词，在从句中所起作用如下：Is he the man who/that wants to see you?他就是想见你的人吗？（who/that在从句中作主语）He is the man whom/ that I saw yesterday.他就是我昨天见的那个人。（whom/that在从句中作宾语）2) Whose 用来指人或物，(只用作定语, 若指物，它还可以同of which互换）, 例如：They rushed over to help the man whose car had broken down.那人车坏了，大家都跑过去帮忙。Please pass me the book whose (of which) cover is green.请递给我那本绿皮的书。3）which, that它们所代替的先行词是事物的名词或代词，在从句中可作主语、宾语等，例如：A prosperity which / that had never been seen before appears in the countryside.农村出现了前所未 有的繁荣。（which / that在从句中作主语）The package which / that you are carrying is about to come unwrapped.参考资料：定语从句-百度百科

定语从句【知识简介】名词或代词由一个从句来修饰，该从句即定语从句。定语从句一般后置，但as引导的修饰全句的定语从句可以前置。引导定语从句的词有关系代词that, which, who, whom, whose, as等以及关系副词when, where, why等。关系代词或关系副词放在被修饰的名词或代词（又叫做先行词）和定语从句之间起联系作用，同时又作定语从句中的一个成份。【要点难点】1)that和which的用法区别只用that的情况：①先行词由最高级修饰时，如the best work that I can do。②先行词由序数词修饰时，如the second book that I bought。③先行词由the last, the only, the same, the very等修饰时。④先行词是不定代词all, anything, everything, little, much, nobody, nothing等时，如anything that he does; all that I can do now等。⑤先行词有any, no, all等限定词时，如all the words that I’ve learned。⑥先行词为词组，该词组既含人又含物时，如the city and the people that I visited。只用which的情况：①在非限定性定语从句中（定语从句前有逗号）。②介词后。请看that和which的使用例句：It’s the best film that’s ever been made on the subject of madness. 这是以精神病为题材而拍摄的影片中最好的一段。Shakespeare is the greatest poet that England has ever had. 莎士比亚是英国最伟大的诗人。（本句中先行词虽是人，但由于前面也有形容词最高级修饰，仍用that较好）Take the first opportunity that offers. 抓住第一个出现的机会。He is the last person that one would suspect. 人们最不可能怀疑他。Man is the only creature that is gifted with speech. 只有人类具有语言的天赋。A fool sees not the same tree that a wise man sees. 一个傻瓜看到的树和一个聪明人看到的树不一样。Those were the very words that he said at the meeting. 这些就是他在会上说的原话。All that glitters is not gold. 闪光的并不都是金子。Anything that you have to say had better be said in each other’s presence. 有话最好当面说。There’s still much that is to be done. 仍然有很多事要做。I have changed my mind. Nothing that you say will change it. 我已经改变了主意，无论你说什么也无法改变它。Nobody that was there could convince her of her mistake. 这那儿没有一个人能使她明白她的错误。Every paper that you read gives the same story. 你看的每份报纸都报道同样的新闻。I still can’t forget the places and the people that I visited during last summer vacation. 我仍然难以忘怀去年暑假我见到的地方和人。2)关系代词（that, which, who, whom等）和关系副词（when, where等）的用法区别①关系代词在定语从句作主语、宾语或表语，而关系副词在定语从句中作状语。②分析时主要从动词的及物性或有无介词来考虑。看如下对比例句：①This is the factory where my father once worked. 这是我父亲曾工作过的工厂。（worked是不及物动词，不接宾语，所以不用which/that。where相当于in the factory）This is the factory which/that my father once worked in.（worked in的宾语是factory，故用关系代词which/that）②I will never forget the days which/that I spent in the wood near our village. 我忘不了我在我村边小树林里度过的日子。（the days是spent的宾语）I will never forget the days when I spent my holidays with my grandparents. 我忘不了我和我的祖父母一起度假的日子。（spent的宾语是holidays，不是the days）I will never forget the small village where I spent my holidays. 我忘不了我度假的小村庄。（与上句一样，spent的宾语是my holidays）③Is this the school which/that you visited the other day? 这是你几天前参观过的学校吗？（the school作visited的宾语）Is this the school where you visited your teacher the other day? 这是你几天前拜访你老师的学校吗？（visited在定语从句中有自己的宾语your teacher，所以不用that/which）3)those who和he who句型两个常用句型。He who常用于谚语中。请看例句：He who doesn’t reach the Great Wall is not a true man. 不到长城非好汉。God helps those who help themselves. 上帝帮助自强的人。He who insists on seeing with perfect clearness before he decides never decides. 坚持一切看清楚之后才做决定的人永远也做不了决定。He was a bold man who first ate an oyster. 第一个吃牡蛎的人是勇敢的人。4)whose的用法whose是关系限定词，既可以指人也可以指物，即既可以说“某人的”，也可以说“某物的”。Fortune never helps the man whose courage fails. 运气永远不会帮助丧失勇气的人。That's the man whose house has burned down. 那就是那位房屋烧毁的人。Have you noticed the house whose windows are closed now? 你注意到了那家窗户关着的房子吗？He’s written a book whose name I have completely forgotten. 他写了一本书，书名我完全忘记了。Above the trees are the mountains, whose magnificence the river faithfully reflects on the surface. 在树林的高处是山，其壮丽的景色完全映照在河面上。注：在正式文体中，指物时，whose往往用of which表示。of which可放在被修饰的名词之前或之后，而whose只能放在被修饰的名词之前。例如：The house whose windows/of which the windows/the windows of which are broken is unoccupied.（那间窗户破了的房屋没人居住。）whose前有时有介词。The teacher in whose class my daughter is studying is a kindhearted man. 我女儿所在的那位老师心地善良。Michel Croz, with whose help, Woolworth climbed to the mountain top, was one of the prefessional guides. 米歇尔?克罗兹是职业向导之一，在他的帮助下伍德沃斯攀登到了山顶。Then we had a chance to talk with that tall man, from whose accent we at once knew that he came from Hunan Province. 后来我们有机会和那个高个子说话，我们从他的口音迅速知道他是个湖南人。5)限制性定语从句和非限制性定语从句的区别限制性定语从句和非限制性定语从句的区别：限制性定语从句是先行词（即被修饰词）不可缺少的定语，限制性定语从句前不用逗号隔开；非限制性定语从句只是对先行词的附加说明，如果去掉，先行词所述对象仍很清楚，非限制性定语从句前常用逗号隔开。这里有两个例句及分析：Those who want to go camping please tell the monitor. 想去野营的人请告诉班长。（定语从句who want to go camping在句中不可少，否则先行词those不知道指谁，也就变得无意义，因此它是限制性定语从句。）Football, which is a very interesting game, is played all over the world. 足球风靡全世界，它是一项很有趣的运动。（定语从句which is a very interesting game只是对意义已很明确的football作一个补充说明，因此它是非限制性定语从句。）注意，非限制性定语从句可以用关系代词which, who, whom, whose, as及介词+which/whom等引导，也可以用关系副词when, where引导，但不能用that引导。另外，非限制性定语从句中的关系代词或关系副词是不能省略的。6)whom的用法只有作定语从句中的宾语时才能用whom；介词后用whom不用who。口语中whom前无介词时可用that或who代替。My brother, whom you met the other day, has gone abroad. 前几天你遇见过的我的那个兄弟，出国去了。I have a few friends whom I could ring to see if they are free. 我有几个朋友，我可以打电话去联系，看看他们是不是有时间。You have many people around you who are kind to you but whom you will soon forget. 你周围有许多对你好的人，但你都会很快忘记他们。There came a lot of children, most of whom I didn’t know. 来了许多孩子，大多数我都不认识。7)介词＋which/whom引导的定语从句如果关系代词which/whom本身在定语从句中充当一个介词或介词短语的宾语的时候，有时可以将介词直接放在which/whom的前面，这样就产生了“介词＋关系代词”及“名词或代词＋介词＋which/whom”或“复合介词＋which/whom”等的结构。I know the man to whom you talked just now. 我认识你刚才与之说话的那个人。Life is a flower of which love is honey. 人生是花朵，爱情是花蜜。He was educated at the local grammar school, after which he went on to Cambridge. 当在当地的一所中学上学，此后就去上了剑桥大学。It’s a family of five children, all of whom are studying music. 这一家有五个孩子，他们都在学音乐。In the attic we found some apples, none of which was fit to eat. 在阁楼里我们发现了一些苹果，其中没有一个能吃的。I have three brothers, all of whom have gone abroad. 我有三个兄弟，他们都出国了。Soon they spotted a mountain, on top of which stood a temple. 不久他们发现了一座山，山顶上有一座庙宇。8)why引导的定语从句关系副词why用在reason之后，只引导限制性定语从句，why在从句中作状语，表示原因。Give me the reason why you should be interested in his affairs. 告诉我你为什么竟对他的事这样感兴趣。The reason why she was ill was that she had eaten bad meat. 她生病的原因是她吃了变质的肉。That is the reason why he raised the question. 这就是他所以提出问题的原因。注意：有时reason后不一定是why引导的定语从句。如下列句子中，reason后接的是which/that引导的定语从句，这是因为，reason在定语从句中作主语或宾语。Is this the reason which/that the chairman gave at the meeting? 这就是主席在会上所给的理由吗？I really can’t understand the reason that/which he explained. 我实在无法理解他所解释的理由。9)where引导定语从句有时修饰一些具有抽象意义的表示地点的名词，如situation, point, position等等。If you are ever in a situation where someone starts shooting, drop to the ground. 如果你遇到有人要射击的情况就摔倒在地上。But after a few days’ stay they got to the point where they could read each other's thoughts. 不过呆了几天之后，他们到了一个彼此能理解相互想法的阶段。It got to the point where I couldn't remember any of the reasons I loved him. 到那时候，我无法记起我爱他的任何理由了。10)the way后的定语从句The way后的定语从句用in which引导，in which可以用that代替，而that又可以省略。所以，表达“某人做某事的方法”有三种形式：1. the way in which somebody does something 2. the way that somebody does something 3. the way somebody does something.11)which指代前面的句中的内容which的这一用法只能以非限定性定语从句出现。Jenny was late for school a third time during the week, which made her teacher very angry. 詹妮一周内第三次迟到了，这使得她老师很生气。?He left early, which was wise. 他早早地离开，那是很明智的。He suddenly became wealthy, which changed his whole mode of life. 他忽然变得富有了，这改变了他整个的生活方式。He often helps me with my lessons, which is kind of him. 他经常在功课方面帮助我，真是感谢他。12)which作关系限定词的情况which作为关系限定词时，其本身代替前面所陈述的内容。She asked me to see the doctor, which advice I took at once. 她要我去看医生，我立即采纳了她的建议。He is studying economics, which knowledge is very important today. 他正在攻读经济学，这门知识在今天是非常重要的。He believes in students’ doing more homework, which idea I am quite opposed to. 他相信要让学生做更多的家庭作业，我非常反对这个观点。which的这种用法常伴随介词而用。常见的词组形式有by which means, during which time, in which case, for which mistake, for which reason等等。She may have missed the train, in which case (=if this happens) she won't arrive for another hour. 她也许没赶上火车，如果那样的话，她一小时是到不了的。I called him by the wrong name, for which mistake I apologize. 我叫错了他的名字，为此我道歉。He didn’t feel well that morning, for which reason he didn’t attend school. 那天早晨他感到不舒服，因此，他没去上学。Tom spent four years in college, during which time he learned French. 汤姆在大学上了四年学，在这段时间里，他学会了法语。13)as用法关系代词as引导定语从句有两种形式。（1）as引导一个非限制性定语从句修饰一个分句，as代表该分句所表达的整个概念或其中一部分的概念。as定语从句可置于句首、句中或句尾；as本身在从句中充当主语、宾语及表语。（2）用于as … as, the same … as, so … as, such … as等结构中。as用法的第一种情况：As is known to all, the earth moves around the sun. 众所周知，地球围绕太阳旋转。He must be an African, as may be seen from the colour of his skin. 他准是个非洲人，这可以从他的肤色看得出来。If he comes late, as is usual, for another time, we’ll not receive him. 如果他再一次像以往那样迟到，我们就不接待他了。She is a fine singer, as her mother used to be. 她是个很出色的歌唱家，像她的母亲当年一样。As you will find out, all is now settled. 你会发现，现在一切都解决了。Helen is somewhat crazy, as everyone could see. 海伦有些神经错乱，这种情况每个人都看得出。注意这一类的as表面上看好像和which代替全句时的用法相似，但as引导的定语从句的最大特点是它的意思多侧重于表达“（正）像……、（正）如……”及类似的意思。一般说来，当关系代词在从句中作be动词的主语或一般动词的宾语时，which和as可交替使用；当关系代词在从句中作一般动词（非be动词）的主语时，只能用which；as可置于句首、句中，而which则不能。例如：He was late for school, as/which was usual with him. 他上学迟到了，他经常这样。He saw the girl, as/which he had hoped (he would). 他见到了那位姑娘姑娘，正像他希望的那样。He saw the girl, which delighted him. 他见到了那位姑娘，这使得他很开心。（句中的which不能用as代替，因为从句中的delighted是非be动词）As has been said before, grammar is not a set of dead rules. 正如上面所说的那样，语法不是一套死的规则。（句中的As不能用Which代替，因为此定语从句置于句首）as用法的第二种情况：There’s as good fish in the sea as ever came out of it. 海里有的是鱼；天涯处处有芳草。Here is so big a stone as no man can lift. 这是一块没人能搬动的大石头。Her manner and attitude toward him were quite the same as they had always been. 她对他的举止和态度和往常是完全相同的。He does not possess such a mind as is necessary to a scientist. 他缺乏科学家所必须具备的头脑。Such food as they gave us was scarcely fit to eat. 他们给我们的食物很不适合吃。A man such as he will surely succeed. 像他这样的人是肯定会成功的。I haven’t much money but you can use such as I have. 我钱不多，可你能用我所有的钱。Such as you see is all we have. 你所见到的就是我们所有的东西。14)介词+whom/which + to do的类定语从句结构的不定式用法This is a useful tool with which to cut steel. 这是可以用来切割钢材的工具。Can you recommend someone from whom to learn how to use the software? 你能推荐一个可以向他讨教使用这一软件的人吗？It’s not a room in which to live comfortably. 这不是可以舒适居住的房间。这一结构的介词位置固定，不可移到动词之后，如第一句中的with which to cut steel不可改成which to cut stell with。15)嵌入式定语从句有一种定语从句，在其从句中的主语和谓语之间有一个插入语如I think。这一种定语从句叫做嵌入式定语从句。嵌入的分句的谓语动词常常是think, believe, guess, imagine, say, suppose, be sure, doubt等等。She offered a suggestion which she said would interest you. 她提出一个她说一定会引起你兴趣的建议。He wrote letters to every person and organization that he believed might be able to help. 他写信给每个人和每个组织，他相信可能有帮助。That is the engineer who I think is the right man chosen for the job. 那位就是我认为适合被选派做这项工作的工程师。 本回答被网友采纳

定语从句，一个句子跟在一名词或代词（先行词）后进行修饰限定，就叫做定语从句。通俗来讲，从句在整个句子中做定语，这个从句就叫做定语从句。

定语从句是什么东西，可以去看看吧，你自己看看你的

定语从句是英语语法教学中极其重要的一个环节。这个问题讲透了，其他各类从句的问题都会很轻松的解决掉。 在此之前，虽然学生已经接触了很多表示时间地点的从句，但由于那些从句的结构和语序与汉语的相似，学生容易接受，教师也没有（同时教学大纲也不要求）在语法结构上做深入的解释。 但是，在讲解定语从句时，学生必须能够准确的了解并掌握：主语，谓语，宾语，状语。（不要着急，要一步一步的循序渐进，先挑重要的讲。）具体步骤如下： 1。先介绍连词：that，which， who， where，when（先不必区分什么是连接代词，连接副词等。先一律简称为“连词”。） 2。介绍一个术语：先行词。 3。用小括号把定语从句与句子的其他部分分隔开，可以告诉学生这叫“断句”。这一步非常困难，但是一定的做，否则下一步无法进行。（要有耐心，要多花点时间，同时还要一直贯穿在整个定语从句的语法教学中。） 4。判断先行词，做出标记。（第一次可能判断不准，但是比起断句来要容易的多，告诉学生后面的定语从句就是修饰这个先行词的。学生不至于连什么叫做“修饰”都不明白吧。） 5。判断定语从句中的主语和宾语。如果缺主语或宾语，就用连词 that，which， who，同时指出你选用的连词就是指代前面的先行词。 （你可以利用数学上的等号 = ）（当然，还有很多详细的语法规矩要遵守，但是做到这一步，学生就能够翻译这个定语从句了。理解了句子的汉语意思，学生就有了成就感，就能有动力继续前进了。） 6。如果从句不缺主语或宾语，就选 where 或 when。（可以先不解释为什么，待学生做到了一定量的题后，这个问题如同窗户纸，一点即破。） 如：( )I work in a business （ ____ almost everyone is waiting for a great chance.） A. how B. which C. where D. that高考▲2004湖南C ( )Jim passed the driving test, （____ surprised everybody in the office. ） A. which B. that C. this D. it高考▲2005浙江A ( )-Do you have anything to say for yourselves? -Yes, there's one point （____ we must insist on.） A. why B. where C. how D. /高考▲2006江西D ( )The village has developed a lot （____ we learned farming two years ago. ） A. when B. which C. that D. where高考▲2007福建D 还要罗嗦一句：尽量选用高考题。在浩如烟海的练习题中，它们还是比较规范的。(当然无法与英美原文相比。) 你好，唐秋菊991！满意吗？如果不满意可以追问。满意的话请采纳。

定语从句是由关系代词和关系副词引导的从句，其作用是作定语修饰主句的某个成分，定语从句分为限定性和非限定性从句两种。状语从句分为时间状语从句，结果状语从句，让步状语从句，原因状语从句，条件状语从句以及行为方式状语从句。名词从句包括主语从句，宾语从句，表语从句和同位语从句及there be句型。一、 限定性定语从句二、非限定性定语从句三、定语从句结构错误定语从句：定语从句，一个简单句跟在一名词或代词后(先行词)进行修饰限定，就叫做定语从句。在主句中充当定语成分。 被修饰的词叫先行词。定语从句不同于单词作定语的情况，它通常只能放在被修饰的词(即先行词)之后。定语 从句由关系词(关系代词、关系副词)引导，关系代词、关系副词位于定语从句句首。 本回答被网友采纳

先将清楚什么是从句接着讲什么是定语接着讲 基本的结构， 先行词，关系代词，副词的概念。

呵呵，我以前学的也是仁爱版耶！ 中文对定语的定义是：定语是名词（通常是主语或者是宾语）前面的连带成份，用来修饰、限制名词，表示人或事物的性状、数量、所属等。英语中定语修饰先行词，也就是中心词啦。先行词是人就用who， The man who standing here is my uncle.（站在那里的那个男人是我叔叔）先行词是the man ，是指人，所以用who。先行词是人但是作宾语用whom，如He is the 先行词，也就是中心词啦。先行词是人就用who， The man who standing here is my uncle.（站在那里的那个男人是我叔叔）先行词是the man ，是指人，所以用who。先行词是人但是作宾语用whom，如He is the most boring speaker whom I have ever met.（他是我见过的最无聊的演说家）I have ever met是来装饰 speaker，而speaker是作宾语，所以用whom，同时作宾语也可用that引导。你再看看这个句子，主句是he is the most boring speaker，主谓宾都齐全了，是一个完整句子，而从句 whom I have ever met 也可以看作是I have ever met whom，也是一个完整句子。所以总之一句话，主语句型，从句句型，两种的句子成分都要完整。从句要紧靠先行词，用什么关系词要弄清句子里缺的是什么。先行词是人用who 或whom，先行词是物 which当先用。关系代词that用法比较广，先行词是人是物都可以，有时候先行词是人，用who可以，用that也是可以，但一般还是得选who，这样结构比较严谨，that比较不正式。先行词是时间用 when ，先行词是地点用where。初中的英语主要是限制性定语从句，其中要特别记住that跟 which的区别，大概七点左右的区别吧，我相信你们老师一定有讲，我就不多说了，你把笔记拿出来认真地再看看，一定要熟记，记得结合例句呀，实在不行就把例句都背下来。非限制性定语从句，就是主句跟从句有个逗号隔开的如此而已。初中对非限制性定语从句要求不多，你只要看到有逗号隔开的就选which就对了。还有，如果在引导词前面有介词，这时也要选which，如：She'll never forget the day on which she joined theparty. 她将永远都不会忘记她入党的那一天。看到which前面有个介词on没？这个on是从on the day来的， 先行词是the day没错，表示时间，所以也可以用when ，到是用when就不需要加on还有一些固定的搭配，1、the time......when(介词＋which,that) 。如：This is the best time when(at which , that) you visit China. 这是你访问中国的最佳时间。 2、The way......that (which)。如： This is the best way that (in which)we can understand each other. 之所以用in which是由于in each other，不能省略in。。 3、 the season...why. 如 He couldn't give the right season why he was late. 他拿不出迟到的合理理由来。。。再之就是主语和谓语要一致。“the(only) one of＋复数名词”时，关系代词如果在从句中作主语，则从句谓语动词用单数，和 “one of＋复数名词”时，关系代词如果在主句中作主语，则从句谓语动词要用复数。例1：He is the only one of the class who (that) won the first prize.他是班上唯一一个获得一等奖的人。例2：that was the only one of the ships which [ was ] lost in the storm. 那是在那场暴风雨中沉没的唯一一艘船。（1、2从句中的谓语用单数形式）。 3、Xi'an is one of the best cities which (that) are famous for its history. 西安是以历史著称的城市之一。4、That was one of the ships which [ were ] lost in the storm.那是在那场暴风雨中沉没的船中的一艘。（3、4句中从句的谓语用复数）。。初中要掌握的大概也就这么多了，定语从句确实是英语中的一个难点，初中学的都还算是比较容易的了。将来上高中上大学的时候还