一、考查关系词的指代及其在从句中所作的语法成分
定语从句要由关系词来引导,关系词分为关系代词和
关系副词。关系代词有:who, whose, whom, that, which 等;关系副词有:when,where,why等。除that只引导限定性定语从句外,其余的关系词既可以引导限定性定语从句,也可以引导非限定性定语从句。
要点提示:要正确使用关系词,就须将两个方面结合起来考虑:一方面是看看关系词所指代的先行词的类属;另一方面是准确分析关系词在定语从句中所作的句子成分。若指人,作主语用who,作宾语用whom(可以省略),作定语用whose(还可指物);若指物且作主语或宾语,则用which(在非限定性定语从句中,也可指代一个情形,即主句全部内容。无论作主语还是作宾语,均不可省略)或that(还能指人,作宾语时,可以省略);作状语指时间用when,指地点用where,指原因用why等。
考题:
1.His parents wouldn't let him marry anyone
_______ family was poor. (MET'88)
A.of whom
B.whom
C.of whose
D.whose
2.Dorothy was always speaking highly of her role in the play, _______ of course, made the others unhappy. (NMET2000)
A.who
B.which
C.this
D.what
3.After living in Paris for fifty years he returned to the small town _______ he grew up as a child. (NMET'96)
A.which
B.where
C.that
D.when
4.Carol said the work would be done by October, _______ personally I doubt very much.(NMET'99)
A.it
B.that
C.when
D.which
5.I also enjoyed the evenings when we spent together. (NMET'95短文改错)
答案及简析:
1.答案为D。此处关系词指代的是anyone,而且作从句中的定语。
2.答案为B。该题旨在考查非限定性定语从句的引导词,只能在A,B之间选择,可是这里并未指人,而是指主句所谈情况,为此,只能选B。
3.答案为B。关系词指代地点the small town,同时在定语从句中充当状语。
4.答案为D。不可认为指代时间by October而误选C。其实,稍加分析就可清楚关系词指代的是主句全部内容且
作doubt的宾语而非状语。
5.此题先行词是表时间的名词evenings,但在从句中用作spent的宾语而不是状语,故须将when改为
that/which或去掉when。
二、考查关系词的搭配方式
关系词的搭配方式主要是指as及作提前介词宾语的which和whom的搭配方式。
(一)as的搭配方式
要点提示:1. 在限定性定语从句中,常见的搭配方式有:the same...as,as...as,not so / as...as, such...as 等。
2.在非限定性定语从句中,常见的搭配方式有:as we all know(=as is known to us all),as is
said(reported,mentioned,etc.)above,as it is等,可置于句首、句中或句末。
考题:
_______ is known to everybody,the moon travels round the earth once every month.(NMET2001)
A. It
B. As
C. That
D. What
答案与简析:答案为B.显而易见,为一固定搭配方
式.As引导的是非限定性定语从句。
(二)which和whom的搭配方式
要点提示:1.多用于限定性定语从句中,作提前介词的宾语,即介词+which/whom.介词的使用要依据定语从句中
动词短语的构成方式而定。
2.在作从句主语时,往往套用:名词(代词、数词
等)+of+which/whom.多见于非限定性定语从句中。
考题:
1.In the dark street,there wasn't a single person _______ she could turn for help. (NMET'92)
A.to whom
B.who
C.from whom
D.that
2.He paid the boy $10 for washing ten windows,most of _______ hadn't been cleaned for at least a year. (MET'90)
A.these
B.those
C.that
D.which
3.Recently I bought an ancient Chinese vase, ______ was very reasonable. (2000上海)
A.which price
B.the price of which
C.its price
D.the price of whose
答案与简析:
1.答案为A。turn to sb. for help 是一固定搭配方式。
2.答案为D。which指代ten windows且作of的宾语,that不能用在非限定性定语从句中,也不能与介词一起提前作宾语。
3.答案为B。which指代the ancient Chinese vase,与the price构成所属关系。
三、考查使用that的情况及关系词的省略现象
(一)只能使用that的情况
要点提示:
1.由不定代词anything,nothing,everything,all, one, little,few,much等充当先行词时;
2. 当先行词前有序数词或形容词最高级修饰时;
3.当先行词被no,the same,the very, the only等修饰时;
4. 当先行词既指人又指物时;
5. 主句是以who开头的疑问句时.
考题:
All _______ is needed is a supply of oil. (MET'89)
A.the thing
B.that
C.what
D.which
答案与简析:答案为B,因为先行词是由不定代词all
充当的。
(二)关系词的省略现象
要点提示:除作宾语的关系代词whom,which,that可以省略外,先行词为way,time等时,可将that省略,其中way 还可以由in which来引导。
考题:
I don't like______you speak to her.(1993上海)
A.the way
B.the way in that
C.the way which
D.the way of which
答案与简析:答案为A.根据句意:我并不喜欢你对她讲话的方式,理应选the way,其后省去了关系代词that。
(文/李英旭；《英语通》高二版 03~04学年度第4期；版权归英语辅导报社所有，独家网络合作伙伴新浪教育，未经许可，不得以任何形式进行转载。)
阿山来自爱问知识人 2005-10-25 19:32
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提问者对答案的评价：
when 和 where 引导定语从句的用法 定语从句既是英语语法的一个重点，同时又是一个难点。说它是难点，主要难在两点上：一点是如何正确判断什么样的汉语句子要译为英语的带定语从句的复合句；另一点是定语从句的引导词较多(包括关系代词who, that, which, as 和关系副词when, where, why)，而且其用法也较复杂。那么到底什么情况下用when和where来引导定语从句呢？它们又该怎么用呢？下面就举例说明： 一、when：当主句中的先行词(即主句中被后面定语从句修饰的词)是表示时间意义的名词时，它只能作定语从句的时间状语，放在定语从句句首。如果定语从句的引导词是作该定语从句的主语或宾语，则要改用关系代词that或which来引导。例如： The days when we used foreign oil are gone. 我们用洋油的日子一去不复返了。 I'll never forget the day when I was born. (=I'll never forget my birthday.) 我永远不会忘记我出生的日子。 It happened in November when the weather was wet and cold. 这事发生在天气又湿又冷的十一月。 In the years that (which) followed, Marx kept on studying English and using it. 在这之后的几年中，马克思继续学习和使用英语。(that作定语从句"that followed"的主语) The day (that) I always remember in all my life is my birthday. 我一生中最难忘的日子是我的生日。(that作定语从句"that I always remember in all my life"的宾语，that可以省略)
where引导的定语从句修饰抽象名词。 一、where定语从句修饰抽象名词point You reach a point where medicine can’t help. 你已到了药物无法治疗的地步。 The crisis has reached a point where the receiver will have to be called in. 危机已达到非把破产管理人叫来不可的地步。 We have reached a point where a change is needed. 我们到了必须改一改的地步。 注：有时point也可以是具体的地点： Let the point where AB cuts CD be called E. 设AB线与CD线的相交点为E。 The accident happened at the point where the A15 joins the M1. 事故发生在A15与M1交叉的十字路口。 二、where定语从句修饰抽象名词case There are cases where the word “mighty” is used as an adverb. 在一些情况下，mighty一词可用作副词。 Today, we’ll discuss a number of cases where beginners of English fail to use the language properly. 今天，我们将讨论一些英语初学者对英语使用不当的问题。 三、where定语从句修饰抽象名词activity Those successful deaf dancers think that dancing is an activity where sight matters more than hearing. 那些失聪的成功舞蹈演员们认为，舞蹈是一种让人看胜过让人听的活动。 四、where定语从句修饰抽象名词situation He got into a situation where it is hard to decide what is right and wrong. 他陷入一种难以分辨是非的局面。 If you risk something important, you cause it to be in a dangerous situation where you might lose it. 你如果拿重要的东西去冒险，那你就是将它置于一种可能会失去它的危险境地。 五、where定语从句修饰抽象名词position It’s put me in a position where I can’t afford to take the job. 这使我陷入一种不能接受此工作的境地。 六、where定语从句修饰抽象名词job
which, who引导的定语从句 看下面的几个例句： It successfully shows the rich culture which makes Beijing so famous. 它成功地展示了使北京闻名遐迩的悠久文化。 The photo which we liked best was taken by Zhao Min. 我们最喜欢的照片是赵敏照的 先行词是物 It successfully shows the rich culture which makes Beijing so famous. 引导词在从句中作主语 先行词是物 The photo which we liked best was taken by Zhao Min. 引导词在从句中作宾语 由此，我们可以看出：which引导的定语从句修饰的是无生命的东西。which 在从句中的成分是可以作主语，也可以作宾语。 下面我们再看一个句子： 先行词是人 His father is the person who will be most unhappy. 引导词在从句中作主语 由此，我们可以看出： 如果先行词是人，那么定语从句的引导词就可以是who。 注意：当who 在从句中作宾语时，在现代语法规则简化为大多数情况下都可用who了。 如：Do you know Mr Zhang who(m) they like very much? 在先行词是物的定语从句中，一般情况下that和which都可以通用, 但在下列情况下, 一般用that而不用which。 (1)先行词为all, everything, nothing, something, anything, little, much 等不 定代词时。 I am sure she has something that you can borrow. (2).先行词被all, little, much, every, no, 等修饰时。 I’ve read all the books that are not mine. (3)先行词被序数词或最高级修饰时。 This is the first book that he has read (4)先行词被the only, the very, the same, the last修饰时。 This is the very book that belongs to him. (5)先行词为人和物的组合。 They talked for an hour of things and persons that they remembered in the
定语从句中which和that用法 在定语从句中，which 和that 在指代事物时，一般可以互换使用，但并非在任何情况下都是这样。 一、宜用that, 而不宜用which 的情况. ①先行词为不定代词all,much,something,everything,anything,nothing,none,the one 等 1. We should do all that is useful to the people. 2. There's nothing that can be said about it. 3. Do you mean the one that was bought yesterday ②先行词被only, any, few, little, no, just, very, one of等词修饰时。 1 .The only thing that we could do was to wait. 2 .That's the very word that is wrongly used. 3 .The last place (that) we visited was the chemical works. 4 .You can take any (=whichever) seat that is free. 5 .I hope the little that I can will be of some help to them. ③先行词是序数词时或被序数词修饰时。 1. When we talk about Wuxi, the first that comes into mind is Tai Lake. 2. This is the third film that has been shown in our school this term. ④先行词是最高级或被最高级修饰时。 1. This is the best that can be done now. 2. The most important thing that should be done right now is how to stop him from going on. ⑤先行词既有人又有物，用which和who都不适合，这时宜用that. 如： writer and his novel that you have just talked about is really well known . rider and his bike that had run over an old woman were held up by the police. ⑥被修饰词为数词时. 1. Yesterday I caught two fish and put them in a basin of water .Now you can see the two that are still alive .
一、从句是如何出题的？ 1. 时态 2. 考连接词 3. 考语言顺序 二、学好从句的两个基本条件 1. 时态 2. 从句的三个必须:①必须是句子；②必须有连接词；③必须是陈述句 三、状语从句、宾语从句、定语从句重点 1.如何判断何种从句 2. 从句的时态 3. 从句的连接词与扩展 4. 经典单选、从句与选词、长句子分析 四、如何判断三种从句 1. 状语从句无先行词 2. 宾语(表语)从句无先行词有动词或词组 3. 定语从句先行词多为名词或代词 一、When引导的定语从句与时间状语从句的区分 1. when的译法不同。在时间状语中，when 翻译成“当……的时候” I want to be a teacher when I grow up. 当我长大的时候，我要做一名老师。在定语从句中，when不翻译。I won't forget the day when he says he loves me. 我不会忘记他说爱我的那一天。 2. 在时间状语中，when从句前面或后面是句子；定语从句中，when 从句不能位于句首，且通常when前为表示时间的名词day、year等。 3. when在从句的作用不同。在时间状语从句中，when是连词，只起连接主句和从句的作用，不做从句的任何成分。不过when引导的时间状语从句修饰主句的谓语，做主句的时间状语。 在定语从句中，when是关系副词，在从句中代替先行词做从句的时间状语，修饰从句的谓语。 例1 I will always remember the days when I lived with my
grandparents in the country. 例2 I always remember the days in the country when I see the photo of my grandparents. 点评：例1意为“我会永远记得跟我祖父母一起住在乡下的那些日子”，其中when 引导的是一个定语从句, 修饰the days, when在从句中作时间状语。例2意为“当我看到祖父母的照片时，总是会想起在乡下的那些日子”，其中when 引导的从句并不修饰前面的名词the country，因此可判定为时间状语从句。 例1中的when可用in which替代，即从句可改为...in which I lived with my grandparents in the country. 例2中从句前有名词，但根据句意可 知并不是从句所修饰的对象，也不能用“介词+ which”来替代。 二、判断关系代词与关系副词 方法一：用关系代词，还是关系副词完全取决于从句中的谓语动词。及物动词后面无宾语，就必须要求用关系代词；而不及物动词则要求用关系副词。例如： This is the mountain village where I stayed last year. 这是我去年呆过的山村。 I'll never forget the days when I worked together with you. 我永远不会忘记与你共事的日子。 判断改错： 1. This is the mountain village where I visited last year. 2. I will never forget the days when I spent in the countryside. 3. This is the mountain village （which）I visited last year.
Where引导定语从句,先行词不一定都表 示地点 1、We will discuss a number of cases __ beginners of English fail to use the language preperly、A、which B、as C、why D、where 2、He was driving so fast as to get himself into a dangerous situation ___he is likely to lose the control over his car、 A、which B、as C、why D、where 两道题都选where ,但就是case, situation都不就是地点,如何理解？ 在“先行词不就是表示地点的名词”的前提下,如何判断就是否使用关系副词where来引导定语从句的问题就是一个高频考点。就就是说,关系副词where 所指代的先行词不只就是表示地点的名词。
用Where引导定语从句,先行词不一定都表示地点按照通常的理解,当where 引导定语从句时,它的先行词就就是表示地点的名词,但事实并不就是我们想象的那么简单。很多情况下,where所指代的先行词并不表示地点。请瞧以下几个例句: Other research, where siblings have been asked to say who their mother and father favor, suggests that mothers do tend to show a preference for their first-born son, but fathers often show great affection for their youngest daughters、 1、Remember that the best relationship is one where your love for each other is greater than your need for each other、请记住,最深的感情关系表现为彼此间的爱超过彼此间的需要。
定语从句中that与who的用法区别 1. 两者均可指人，有时可互换（包括当先行词为all, anyone, someone等，同时也包括先行词受the only 等的修饰时）： All that [who] heard him were delighted. 所有听了他讲话的人都很高兴。 He is the only one among us that [who] knows Russian.他是我们中间唯一懂俄语的人。 Anyone who [that] is over sixteen is allowed in. 任何超过十六岁的人都允许进去。 It is impolite to turn your back on someone who [that] is speaking to you. 人家跟你说话，你把背朝人是不礼貌的。 2. 但是在下列情况，通常要用that： ①当先行词是一个既指人又指物的并列词组时： I made a speech on the men and things that I had seen abroad. 我就我在国外所见到的人和事作了报告。 ②当先行词是who时(为避免重复)： Who was it that won the World Cup in 1982? 谁赢得了1982年的世界杯？ ③当关系代词在定语从句中作表语时(可省略)： Tom is not the boy (that) he was. 汤姆这孩子已不是以前那个样子了。 3. 但是在下列情况，通常要用who： 当先行词为those 且指人时，英语习惯上要用who 来引导定语从句。如： Those who do not wish to go need not go. 不愿去的人不需要去。 Those who couldn’t walk were carried on stretchers. 那些不能走的人都用担架抬着。 It is said that those who eat the most are the least healthy. 据说吃得最多的人身体最差。 Only those who had booked in advance were allowed in. 只有那些预先订票的人可以进去。 The plan was supported by those who wished to listen to more good English. 这计划受到想多听好英语的人的支持。 Let us spend a few moments in silence so that / in order that we remember those who died to preserve our freedom. 让我们默哀片刻，以缅怀那些为维护我们的自由而牺牲了的人们。 注：偶尔也可见到在 who 之后用that 引导定语从句的用例，但相当少见。如： The danger is that people who pay their bills on time will be lumped in with those that don’t. 危险的是那些及时付账的人将会同那些不及时付账的人混在一起。
定语从句中的that和which的用法 引导定语从句的关系代词有：that（指人或物）,which （指物）,who (指人）.指人时可用that或who ；指物时可用that 或which 。 That和which在从句里都可以做宾语和主语，做宾语时可以省略。指物时，两者一般可以互换，但在下列情况下只能用that： 1）当先行词是all ,any ,anything ,everything ,nothing 或被它们修饰时.例如： Is there anything that I can do for you 有什么可以为你做的吗? All that can be done must be done . 凡是能做的都必须做. 2）当先行词被形容词的最高级或序数词修饰时.例如：That is one of the most interesting books that are sold in the bookshop . 那是这家书店出售的最有趣的书之一. The first thing that we should do is to get some food . 我们该做的第一件事是弄点吃的. 3）当先行词有：the only ,the very ,the same ,the last 等修饰时.例如：
My necklace is not the only thing that's missing . 我的项链不仅是丢掉的东西. 4）当主句以who或which开头时,定语从句中引导词用that ,不用which 或who .以避免重复.例如： Who is the girl that is wearing a red coat 正穿一件红色外套的女孩子是谁? 5）当先行词既有人又有物时,用that .例如： The writer and his novel that you have just talked about are really well known . 你刚才谈起的那位作家以及他的小说确实很著名. 请注意: 以下几种只能使用which的情况: 1.引导非限制性定语从句，用which。 2.在“介词＋关系代词”结构中，关系代词必须用which。 如：The house in which we live is very large. 我们住的房子非常大。 This is the reference book of which the teacher is speaking. 这就是老师正在谈及的那本参考书。 注意：如果介词不放在修饰事物的限定性定语从句的句首，which就可换为that，例如：This is the question which/that we've had so much discussion about. =This is the question about which we've had so much discussion.
as引导定语从句的用法 as 引导非限制性定语从句，可放在主句之前，或者主句之后，甚至可以切割一个主句；which 引导的非限制性定语从句只能放在主句之后。另外，as有“正如……，正像……”的意思 (1) As is known to all, China is a developing country. (2) He is from the south, as we can see from his accent. (3) John, as you know, is a famous writer. (4) He has been to Paris more than several times, which I don’t believe. ================================ 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). 例2. as可引导非限制性从句，常带有'正如'。 As we know, smoking is harmful to one's health. 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 a lways 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 / which一起代替。do可以出现，也可以不出现，但不能用其它动词代替。 3. 句子作先行成分。 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：1. 形容词做先行成分时：形容词或形容词短语（含具有形容词性质的名词）作先行成分，“as / which”特殊定语从句置于先行成分之后。 2. 动词短语作先行成分时：动词短语作先行成分时，“as / which”特殊定语从句置于先行成分之后。但是，当从句中含有表示主观意志的插入成分时，“as”特殊定语从句可以移至句子之首。 3. 句子作先行成分时：“as”特殊定语从句的位置较灵活，可以置于先行成分之前、之中或之后。但如果先行成分是直接引语，“as”特殊定语从句多在先行成分之前。如果先行成分是否定句，“as”特殊定语从句与否定词的相对位置不同可以使它产生不同的意义。由于“as”特殊定语从句具有这一特点，所以有时它的位置不能随便移动。在非正式的文体里，“which”特殊定语从句可以出现在先行成分之中。
初中英语语法who which和that引导的定语从句 初中英语语法who, which和that引导的定语从句 【链接中考】 ( ) 1. Is that the man ______ helped us a lot after the earthquake? (2009浙江杭州) A. whose B. which C. when D. who ( ) 2. Sorry, we don’t have the c oat ______ you need. (2009河北) A. what B. who C. whom D. which ( ) 3. I’ve found some pictures of the most interesting places _______ you can visit during the winter holidays. (2009山东烟台) A. where B. which C. what D. that 【概念】在复合句中作定语的从句叫定语从句。 先行词：被定语从句修饰的名词或代词称为先行词。 关系词：引导定语从句的词叫关系词，也叫引导词。关系词包括关系代词和关系副词。关系代词有that, which, who, whom, whose等，关系副词有where, when, why等。 【关系代词的功能】 关系代词在从句中的功能 that 作主语或宾语(指人或物) which 作主语或宾语(指物，可与that互换) who 作主语或宾语(指人，可与that互换) 【温馨提示】 ◆that和which在从句中作宾语时常可省略。 ◆以下情况的定语从句常用that引导而不用which： (1) 先行词是不定代词all, few, little, much, everything, nothing, anything等时; (2) 先行词被形容词最高级修饰时; (3) 先行词被序数词修饰时; (4) 先行词被the very, the only, the last等修饰时; (5) 先行词被all, every, any, little, no等修饰时; (6) 先行词既有人又有物时。 ◆先行词在从句中作介词的宾语且介词前置时，只能用which或whom引导。 【语法闯关】用适当的关系代词填空。 1. I prefer shoes ______ are cool. 2. My necklace is not the only thing ________ is missing. 3. These are the best stamps _______ Kate has given me. 4. The building in ______ you live is comfortable. 5. —Is everything ______ we need to do done? —Yes. You needn’t worry about it. 6. The man ______ stands over there is my Chinese teacher. 7. I want to read all the books ______ were written by Guo Jingming. 8. The book ______ has a red cover is a storybook. Key： 【链接中考】1-3 DDD 【语法闯关】
英语语法：定语从句中的that和which 英语语法：定语从句中的that和which That which代表物，区别听我来叙述; 先行若是不定代，that就把which 踹; 当先行词为anything，everything，nothing，all，any，much，many，one等不定代词时，只能使用“that”,不用“which”。 例：Is there anything that I can do for you? 我能给你做点什么吗? 先行词前有两数，就用that定无误; 当先行词是基数词或序数词修饰时，只能使用“that”，不用“which”。 例句： That is the second time that I have been to Japan. 那是我去日本的第二次。 The two buildings that lay on the River Thames fell down last week. 坐落在泰晤士河岸边的那两座大楼上星期倒塌了。 先行词前最高级，还用that必无疑; 当先行词是形容词最高级或被形容词最高级修饰时，只能使用“that”,不用“which”。 例句：This is the most wonderful time that I have ever had. 这是我度过的最美好的时光。 句中若有there be, that应把which替; 例：There is no evidence that animals possess a mysterious sixth-sense allowing them to pre dict natural disasters. 说动物拥有神秘的第六感，可以预知自然灾害，这是没有根据的。 先行主中做表语，避免重复从句里; 例句：1)This is not the hospital that it used to be.
As、but和than通常都是以介词、连词等身份被大家所熟知，而它们居然可以摇身一变成为关系代词，在定语从句中做主语和宾语。As As最基本的用法是做连词“与……一样”表示同级的比较，介词“作为”。下面是它特殊的用法， 例句：1. He does not possess such qualifications as are necessary to be an actor. 他并不具备一名演员应有的资格。2. She bought the same skirt as I had bought last week so I need to talk to her about it so we don't wear them the same at the same time. 她买的那条裙子和我上周买的一模一样，我要和她商量一下，免得“撞衫”。上面两个例句中定语从句都使用了as作为关系代词，我们可以发现例句1中含有“such…as…”，例句2中含有“the same…as…”，由此可见，我们到底要不要使用as来做关系代词，可以根据句中是否出现了与as搭配的短语进行判断。3. The murderer who had killed several people on the campus was finally arrested by the police, as was expected. 如我们所愿，那个在校园杀害数人的杀人犯终于被警方逮捕。该句中并未出现与as搭配的短语，此处的用法是as做关系代词指代前面整个句子，在定语从句中做主语。 But大家熟悉的but基本都是以转折连词的身份出现，但是它还兼职在做定语从句中的关系代词。例句：There is no man but errs. 没有任何人能够不犯错误。句中的先行词是man，but 自然就充当了关系代词的角色，但我们从句意中可以发现，but带有一层否定的意思，相当于“who not”。那么我们可以把例句转换为：There is no man who does not err. 但要注意，只有在but 前有先行词的时候才有此用法！请比较下面这个例句：He did nothing after graduation but spend his parents' money. 他毕业之后无所事事，就知道花爸妈的钱。该句中but 是介词的用法，有转折的意义。 Than即可以做连词也可以做介词的than都是比较的含义，它居然也可以用在定语从句中。例句：1. Parents had better not give kids more money than is needed. 父母最好别给孩子们太多的钱，够用就可以了。2. Don't order more food than can be finished. 别点太多吃的，会吃不完的。此处Than以主语的形式出现在定语从句中，其实省略了what，than也就等于than what。例句也可以写作：Parents had better not give kids more money than what is needed 例句2则可以转换为：Don't order more food than what can be finished 不管是做介词、连词也好，在定语从句里做关系代词也罢，than都表示了一个比较的关系，从上述两个例句来看，句中都出现了比较级的形式。 一、but可被看作关系代词，引导定语从句，在句中作主语，在意义上相当于who not或that not，即用在否定词或具有否定意义的词后，构成双重否定。 如：①There is no mother but loves her children．没有不爱自己孩子的母亲。 ②There was no one present but knew the story already．在场的人都知道这个故事。 二、than作关系代词时，一般用在形式为比较级的复合句中，其结构为形容词比较级（more）．．．than＋从句，than在从句中作主语，相当于that，代表它前面的先行词。（这时，它兼有连词和代词的性质，也有学者认为这种用法的than是连词，后面省略了主语what。） 如：①The indoor swimming pool seems to be a great deal more luxious than is necessary．室内游泳池过于豪华。 ②He got more money than was wanted．他得到了更多的钱。
关系代词who引导定语从句作句子的主语、宾语。定语从句由关系代词who、whom、whose、which、what、as和关系副词where、when、why等引导。 who的用法 1.who引导的定语从句的先行词是表示人的名词或代词。例如： （1）The student who is answering the question is John. 正在回答问题的那个学生是约翰。 （2）Anybody who breaks the laws will be punished. 任何违反法律的人都将受到惩罚。 2.who是主格，在定语从句中作主语，此时不能省略。例如： （1）The person who was here yesterday is a musician. 昨天来这儿的那个人是位音乐家。 在非正式英语中，who亦可作宾语，且可以省略。例如： （2）The man（who）I saw just now is Mr Li.我刚才见到的那个人是李先生。 3.在定语从句中，who在人称、数上和其前面的先行词保持一致。如： Do you know the boy who is standing over there? 你认识站在那边的那个男孩吗？ 4.若先行词中既有人又有物，关系代词用that而不用who。例如： He watched the children and boxes that filled the car. 他看见了塞满汽车的孩子和箱子。
5.若先行词前面有形容词最高级、序数词修饰，关系代词用that而不用who。例如： （1）Yao Ming is the best basketball player that I know. 姚明是我知道的最好的篮球运动员。 （2）Tom is the first boy that left the room. 汤姆是第一个离开这个房间的男孩。
定语从句中的that和which的区别： that和which在从句里都可以做宾语和主语，做宾语时可以省略。在定语从句中,有种说法叫"关宾省",意思是关系代词在限制性定语从句中作宾语可以省略,不管是that，which，还是whom。但是which能引导非限制性定语从句，that则不行。 只能用that的几种情况： 1. 当先行词为all, much, little, none及由any, every, some, no所构成的复合不定代词时。We should do all that is useful to the people. Please tell me anything that you know about the matter. 2. 当先行词被any, few, little, no, all, much, some等词修饰时。 You can take any seat that is free. There is little work that is fit for you. 3. 当先行词为序数词或被序数词所修饰时。 When people talk about the cities of China, the first that comes to my mind is Beijing. This is the fourth film that has been shown in our school this term. 4. 当先行词为形容词最高级或被形容词最高级修饰时。 The best that I could do was to apologize. This is the most interesting story book that I have ever read. 5. 当先行词被the very, the only, the last, the just, the same等修饰时。 This is the very book that I’m looking for. The only thing that we could do was to wait. 注意：先行词被the same修饰时，关系代词也可用as。 I need the same book that / as you have. 6. 当先行词既包含人又包含物时。 They are talking of the heroines and their deeds that interest them. 7. 当先行词是疑问代词who，which，what或主句以这些词开头时。 Who that has ever worked together with him doesn’t admire him? Which is the star that is nearer to the earth？ 8. 当先行词为主句表语或关系代词为从句表语时。 That’s a good book that will help you a lot. Our school is no longer the place that it used to be. 9. 先行词为time时，当time表示次数，引导词用that, 可省略。当表示时间，可用that 或when引导，都可省略。 I do remember the first time(that) I had ever heard the sweetest voice in the world. I did't remember the exact time （when/that）I arrived in Shanghai last month. 只能使用which的情况: 1. 在“介词＋关系代词”结构中，关系代词必须用which。 The house in which we live is very large. This is the reference book（参考书）of which the teacher is speaking. 注意：如果介词不放在修饰事物的限定性定语从句的句首，which就可换为that。 This is the question which/that we’ve had so much discussion about. =This is the question about which we’ve had so much discussion. 2. 先行词为“those＋表事物的复数名词”时，关系代词通常只用which而不用that。 You should grasp well those skills which may be used in the future work.