定语从句用法的总结
定语从句在句中相当于一个形容词，下面定语从句用法的总结是小编想跟大家分享的，欢迎大家浏览。
一.定语从句及相关术语
1.定语从句：修饰某一句中的名词或代词的从句称为定语从句，一般紧跟在它所修饰的先行词后面。被修饰的词称为先行词。
2.关系词：引导定语从句的关联词称为关系词
关系词有关系代词和关系副词。关系代词有that, which, who, whom, whose, as等;关系副词有where, when, why等。
关系词常有3个作用：
1，引导定语从句。
2，代替先行词。
3，在定语从句中担当一个成分。
二.关系代词引导的定语从句
1.who指人，在从句中做主语
(1)The boys who are playing football are from Class One.
(2)Yesterday I helped an old man who lost his way.
2. whom指人，在定语从句中充当宾语，常可省略。
(1) Mr. Liu is the person (whom) you talked about on the bus.
(2) Mr. Ling is just the boy whom I want to see.
注意：关系代词whom在口语和非正式语体中常用who代替，可省略。
(3) The man who/whom you met just now is my friend.
3. which指物，在定语从句中做主语或者宾语，做宾语时可省略
(1) Football is a game which is liked by most boys.
(2) This is the pen (which) he bought yesterday.
4. that指人时，相当于who或者whom;指物时，相当于which。在宾语从句中做主语或者宾语，做宾语时可省略。
(5) The number of the people that/who come to visit the city each year
rises one million.
(6) Where is the man that/whom I saw this morning?
5. whose通常指人，也可指物，在定语从句中做定语
(1) He has a friend whose father is a doctor.
(2) I once lived in a house whose roof has fallen in.
whose指物时，常用以下结构来代替
(3)The classroom whose door is broken will soon be repaired.
(4)The classroom the door of which is broken will soon be repaired.
(5)Do you like the book whose cover is yellow? (6)Do you like the book the color of which is yellow?
三.介词+关系代词引导的定语从句
1. 关系代词在定语从句中做介词宾语时，从句常由介词+关系代词引导
(1)The school (that/which) he once studied in is very famous.
(2)The school in which he once studied is very famous.
(3)Tomorrow I will bring here a magazine (that/which) you asked for.
(4)Tomorrow I will bring here a magazine for which you asked.
(5)We’ll go to hear the famous singer (whom/that/who) we have often talk-ed about.
(6) We’ll go to hear the famous singer about whom we have often talked.
2.关系代词前的介词的选择
* 由先行词的习惯搭配或根据先行词的需要。
(1) The speed at which light travels is 300,000 km per second. (at the speed of …以…速度)
(2) The reason for which he didn’t come to school was that he was ill. (for a certain reason 由于某种原因)
* 介词可能是从句短语动词的一个固定部分或固定搭配
(3) Don’t bring children to see the animals of which they are afraid. (be afraid of 害怕)
(4) This is the teacher from whom I borrowed the book. (borrow from…从…借入
注意：1. 含有介词的动词短语一般不拆开使用，如：look for, look after, take care of等
(1) This is the watch which/that I am looking for. (T)
(2) This is the watch for which I am looking. (F)
2. 若介词放在关系代词前，关系代词指人时用whom，不可用who或者that;指物时用 which，不能用that;关系代词是所有格时用whose
(1) The man with whom you talked is my friend. (T)
(2) The man who/that you talked with is my friend. (F)
(3) The plane in which we flew to Canada is very comfortable. (T)
(4) The plane in that we flew in to Canada is very comfortable. (F)
3. “介词+关系代词”前可有some, any, none, both, all, neither, most, each, few等代词或者数词
(1) He loved his parents deeply, both of whom are very kind to him.
(2) In the basket there are quite many apples, some of which have gone bad.
(3) There are forty students in our class in all, most of whom are from big cities.
四.关系副词引导的定语从句
1. when指时间，在定语从句中做时间状语
(1) I still remember the day when I first came to the school.
(2) The time when we got together finally came.
2. where指地点，在定语从句中做地点状语
(1) Shanghai is the city where I was born.
(2) The house where I lived ten years ago has been pulled down.
3. why指原因，在定语从句中做原因状语
(1) Please tell me the reason why you missed the plane.
(2) I don’t know the reason why he looks unhappy today.
注意：1.关系副词引导的从句可以由“介词+关系代词”引导的从句替换
(1) The reason why/ for which he refused the invitation is not clear.
(2) From the year when/in which he was going to school he began to know what he wanted when he grew up.
(3) Great changes have taken place in the city in which./where I was born.
2.当先行词为时间、地点、原因名词时，如果在从句中不是作状语时，不可用关系副词引导。
(1)The reason (that/which) he gave for being late is that his mother was ill.
(2)They make me think of the happy days (that/which) we spent together.
(3)Is this factory the one (that/which) they visited the day before yester- day.
定语从句用法讲解
一、定语从句的识别
1、结构识别：名词+连接词+句子
【例句】Kevin gave us a wonderful training course, which left us a deep impression.
【解析】这个句子的前身应该是这样的：Kevin gave us a wonderful training course. It left us a deep impression. it就是指代前面这个句子，这样两个句子就有了共有的名词，连接两个具有共同名词的句子是定语从句的作用，就可以用which代替it，这样就有了示例中的非限定性定语从句。
2、常用连接词：
关系代词：who, whom, which, that, as, whose
关系连词：when, where, why, how
介词+关系代词：as和that以及who一般不能接到介词后引导句子
二、定语从句的处理方法
1、按照定语的处理方法将定语从句前置，这种处理方式适用于比较短的和起修饰限定作用的定语从句。
2、在考研中大多数的定语从句起的作用是连接句子，因此我们通常把定语从句从整个句子中独立拆分出来单独成为一个句子，这种处理方法的关键是找到连接词，拆分点就是连接词。
对于“介词+连接词”引导的定语从句，拆分点就在介词处。
【例句】There is something by virtue of which man is man.
【译文】存在一种特性，人之所以为人就是由于这种特性。
【解析】这句话其实是由以下两句话变来的：
1)There is something.
2)Man is man by virtue of this thing.这两句话中有共有的名词something和this thing，用which替换掉this thing再把of which提前，得到：There is something of which man is man by virtue
三、例句分析
【例句】Such large, impersonal manipulation of capital and industry greatly increased the numbers and importance of shareholders as a class, an element in national life representing irresponsible wealth detached from the land and the duties of the landowners; and almost equally detached from the responsible management of business.
【译文】对资本和企业的这种大规模的非个人操纵大大增加了股东作为一个阶级的数量和重要性。这个阶层作为国计民生的一部分，代表了非个人责任的财富与土地及土地所有者应尽义务的分离，而且也几乎与责任管理相分离。
【解析】句子的主干为：Such large, impersonal manipulation of capital and industry greatly increased…shareholders as a class, (which was) an element…这句话的难点还在于其主语和宾语都有较长的短语和of结构限定，并且分句是由两个and相连的3个部分组成的。
分句an element…landowners又带有两个定语从句，一个是(which was)representing…，另一个是(which was)detached…。可见，定语从句的难点在于经常省略“引导词+be”的结构，从而在理解上容易和分词结构相混淆。实际上定语从句并不符合汉语的使用习惯。所以翻译时遇上定语从句，一定不要机械地按照原来的顺序生搬硬套。像这样分句较长的情况，把主句和分句拆为两句是比较好的方法。所以这里从“这个阶层”开始另起一句。
定语从句用法的详解
一、定语从句的有关概念
所谓定语从句，就是在复合句中起定语作用以修饰主句中的名词或代词的从句。学习定语从句，首先要弄清两个重要概念——先行词和关系词。
先行词是我们汉语中从来没有听过的一个新概念，它其实指的就是被定语从句所修饰的词。由于定语从句修饰名词或代词时，定语从句通常是后置的，所以人们就将放在定语从句前被定语从句修饰的名词或代词叫先行词。
那什么是关系词呢？其实它就是用于引导定语从句的引导词。事实上，英语中的各类从句，不管性质如何，它们都需要有一个词来“引导”，正如人们给引导状语从句的词语取了个名字叫从属连词一样，人们也给引导定语从句的词语取了个名字，叫它关系词，因为它通常被放在先行词和定语从句之间起连接作用，以表明两者之间的修饰关系，同时它还在定语从句中充当一定的句子成分。
二、定语从句中关系词与所修饰先行词的关系
为了更好地理解定语从句，我们还有必要研究一下关系词与先行词之间的关系。但在研究这种关系之前，我们先来看看关系词有哪些。
根据关系词在定语从句中的作用，我们可以将关系词分为关系代词和关系副词两种。所谓关系代词就是指起代词作用的关系词，它们在引导定语从句的同时，还在定语从句中充当主语、宾语、宾语等，英语中比较常用的关系代词有that, which, who, whom, whose等。
类似地，关系副词就是指起副词作用的关系词，它们在引导定语从句的同时，还在定语从句中充当状语等，英语中比较常用的关系副词只有三个，即when, where和why。
许多初学定语从句的人弄不清关系词与先行词之间到底是什么关系。其实啊，关系词与先行词之间的关系很简单，简单得可以划一个等号。因为，关系词的含义在本质上等价于先行词，它与先行词指的就是同一个人或同一个事物。为便于理解，下面我们来看几个例子吧。
I know the man who lives next door.我认识住在隔壁的那个人。
这是一个含有定语从句的复合句。句中的the man为先行词，who lives next door为修饰the man的定语从句；在定语从句中，who是关系词，它在定语从句中用作主语，从意义上说，它在此所表示的意思与先行词the man等价，换句话说，上面这个句子与下面这个句子等价：I know the man. He lives next door.我认识这个人，它就住在隔壁。
She will never forget the day when she got married.她永远不会忘记她结婚的这一天。
句中的the day为先行词，when she got married为修饰the day的定语从句；在定语从句中，when是关系词，它在定语从句中用作状语，从意义上说，它在此与“介词+先行词”所表示的意思等价，也就是说上面的句子与下面这个句子等价：She will never forget the day. On that day she got married.她永远不会忘记这一天，在这一天她结婚了。
三、定语从句的翻译
许多英语初学者往往弄不明白为什么引导定语从句的关系词which不能译为“哪一个”，who不能译为“谁”，when不能译为“什么时候”，where不能译为“什么地方”，等等。
首先，我们必须要明白一点，那就是引导定语从句的which, who, when, where, why等是关系词（关系代词或关系副词），而不是疑问词，所以不能按疑问词的意思来理解。
前面我们讲到，英语中的定语从句总是后置的，即要放在被修饰名词或代词之后；但在汉语中，定语通常是前置的，也就是说定语要放在被修饰名词的前面，并通常表现为“……的”这样的形式。当我们翻译英语中定语从句的时候，一般可以按汉语习惯，将定语从句翻译在被修饰的名词或代词之前，而其中的关系词一般就是译成汉语中的“……的”。如：
He showed me the article that he had written.他把他写的文章拿给我看。
句中的that he had written为修饰名词the article的定语从句，翻译时就可译为“他写的文章”，其中的关系代词that在此译成了“的”字。
She was not in the train which arrived just now.她不在刚到的那列火车上。
句中的which arrived just now为修饰名词the train的定语从句，翻译时就可译为“刚才到的那列火车”，其中的关系代词which在此也译成了“的”字。
Sunday is the day when very few people go to work.星期日是没什么人上班的日子。
句中的when very few people go to work为修饰名词the day的定语从句，翻译时就可译为“没什么人去上班的日子”，其中的关系副词when在此也译成了“的”字。
That’s the hotel where we were staying last summer.这就是我们去年夏天住的旅馆。
句中的when very few people go to work为修饰名词the day的定语从句，翻译时就可译为“没什么人去上班的日子”，其中的关系副词when在此也译成了“的”字。
Give me one reason why we should help you.给我举出一个我们应当帮助你的理由。
句中的why we should help you为修饰名词one reason的定语从句，翻译时就可译为“我们应当帮助你的理由”，其中的关系副词why在此也译成了“的”字。
当然，我们上面介绍的是翻译定语从句最简单同时也是最基本的方法，由于英语句子千变万化，定语从句的表现形式也灵活多样，有些含有定语从句的句子可能用此方法翻译会显得别扭，但只要掌握了这个基本的方法，再加上适当的变通，翻译定语从句也就不难了。
四、定语从句中关系代词的省略
省略关系代词最典型的情形就是当关系代词在定语从句中用作宾语的时候。在定语从句中能够用作宾语的关系代词有that, which, who, whom。如：
Those books (that) you lent me were very useful.你借给我的那些书很有用。
句中的(that) you lent me为修饰those books的定语从句，引导定语从句的关系代词that在定语从句中用作动词lent的宾语，故可以省略。
I wore the necklace (which) my mother had left me.我戴着我妈留给我的项链。
句中的(which) my mother had left me为修饰the necklace的定语从句，引导定语从句的关系代词which在定语从句中用作动词left的宾语，故可以省略。
Do you still remember the boy (who, whom) I was going out with?你还记得那个跟我约会的小伙子吗?
句中的(who, whom) I was going out with为修饰the boy的定语从句，引导定语从句的关系代词who / whom在定语从句中用作句尾介词with的宾语，故可以省略。
注意：我们说的关系代词的省略只限于限制性定语从句，在非限制性定语从句中，即使关系代词用作宾语也不能省略。另外，当关系代词直接用作介词后作宾语时，此时也不能省略。如：
I wanted to find someone with whom I could discuss books and music.我想找到一个可以和我谈书和音乐的人。
此句中的关系代词which虽然也是用作宾语，但不能省略，因为它是直接跟在介词with后面作宾语。但是，如果将此句改写一下，将介词with置于句末，则可以将关系代词whom省略。如：
I wanted to find someone (whom) I could discuss books and music with.我想找到一个可以和我谈书和音乐的人。
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