1. 在复合句（包括主句和从句）中，修饰主句中某一名词或代词的从句叫定语从句。定语从句必须放在被修饰的词之后，被定语从句修饰的名词或代词叫做先行词。如：[文章版权 禁止转载:考试与评价 K?"b Nv?@b\H
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The man who lives next to us sells vegetables. 住在我们隔壁的那个人是卖蔬菜的。[文章版权 禁止转载:考试与评价 =`P+rsDBp
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You must do everything that I do. 你必须做我所做的一切。[文章版权 禁止转载:考试与评价 S: @
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2. 由that， which， who(whom)等关系代词引导的定语从句，关系代词可在从句中做主语、宾语或表语。通常which指事物，who指人（作宾语时用whom），that 既可指人也可指物。但在使用时有所区别：[文章版权 禁止转载:考试与评价 q,zKS{/:; btew |FroG]
A. 定语从句须用that引导的情况：[文章版权 禁止转载:考试与评价
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(1)先行词是all， much， little， none， the one 等不定代词或由no-， any-， every-构成的复合不定代词。如：[文章版权 禁止转载:考试与评价 wQ!Q7OT+hW3@LJCr/RFroG]
All that is worth doing should be done well. 一切值得做的事都应该做好。[文章版权 禁止转载:考试与评价 8
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(2)先行词被all， every， no， some， any， little， much， one of， the only， the[文章版权 禁止转载:考试与评价 JPg^yX7(/
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very， the right等修饰时。如：[文章版权 禁止转载:考试与评价 '-.)D
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There is little money that I can spend on books. 我几乎无钱买书。[文章版权 禁止转载:考试与评价 5~e%\KVhq lwjoKh FroG]
The only thing that she could do was to go to the police for help. 她唯一能做的事就是去求助于警察。[文章版权 禁止转载:考试与评价 ~Q N+;J={R !^n\T]FroG]
(3)先行词是序数词或被序数词修饰时。如：[文章版权 禁止转载:考试与评价 Fz$ l?h{qQ`;M r|IFroG]
We will never forget the first lesson(that) our chemistry teacher gave us. 化学教师上的第一课我们永远难忘。[文章版权 禁止转载:考试与评价 u/`jL a(o?~ne&=u,zkFroG]
(4)先行词是形容词最高级或被形容词最高级修饰时。如：[文章版权 禁止转载:考试与评价 \9& .A:nIL"=t0f?^;FFroG]
What is the smallest thing that can be seen under a microscope? 显微镜下能看见的最小的东西是什么？[文章版权 禁止转载:考试与评价 U( B8TA
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(5)先行词同时包含人和事物时。如：[文章版权 禁止转载:考试与评价 ^@ema{'oB|&vRS&`FroG]
The visitor spoke highly of the children and the performances(that) they saw at the Children's Palace. 来宾们高度评价他们在少年宫见到的孩子们及其表演。[文章版权 禁止转载:考试与评价 tg 9iSJ\$Lj
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(6)当主句为who或which开头的特殊疑问句时，为避免重复，习惯上多用that。如：[文章版权 禁止转载:考试与评价 ov
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Which of us that knows any English doesn't know the meaning of UFO? 我们懂英语的人中谁不知道UFO的意思？[文章版权 禁止转载:考试与评价 ^1(:4n d!e(A_Dl FroG]
(7)当关系代词在定语从句用to be 作表语时。如：[文章版权 禁止转载:考试与评价 V8 y=k6!ny?4"t�L3UFroG]
Tom is not the boy(that) he used to be. 汤姆已不是过去的那个男孩了。[文章版权 禁止转载:考试与评价 AZA|r/W]}4Ip{6j9DFroG]
(8)当主句以There be开头时。如：[文章版权 禁止转载:考试与评价 F\Q&z* &z,Zr�(/3FroG]
There is something that I must deal with right now. 我有事情必须马上处理。[文章版权 禁止转载:考试与评价 |ru&zJV-�*`WFroG]
(9)当先行词为way， moment， time等时，用that，且常省略。如：[文章版权 禁止转载:考试与评价 |k =Y=G]qHA9$Wh^ ?FroG]
The real problem with pollution is people—the way (that) people think about their environment. 污染的实质问题是人—人们在考虑其自身环境时就是这样想的。[文章版权 禁止转载:考试与评价 ACst O(A1E3`FroG]
B. 定语从句须用which引导的情况：[文章版权 禁止转载:考试与评价 ] !W^() @2( TFroG]
(1)在非限制性定语从句中。如：[文章版权 禁止转载:考试与评价 G &%7JIa6T:|2wktO$FroG]
Let's discuss the question， which we are interested in. 咱们讨论一下这个问题，这个问题我们大家都很感兴趣。[文章版权 禁止转载:考试与评价 Ez0G*Y
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(2)在定语从句中作介词宾语，且直接置于介词之后时。如：[文章版权 禁止转载:考试与评价 Sr:?9r �;05ud?S*FroG]
His house， for which he paid 10，000 yuan ten years ago， is now worth 30，000 yuan. 他的房子现在值三万元，十年前他是花一万元买的。[文章版权 禁止转载:考试与评价 E T/}S Ub@s� |[uFroG]
C. 定语从句须用who(whom)引导的情况：[文章版权 禁止转载:考试与评价 T)oj=N4MA^2C 2|*7FroG]
(1)当先行词all， any 和a few指人时。如：[文章版权 禁止转载:考试与评价 'rO.#()Jrs9gT?%ZxkFroG]
Any who breaks the law will be punished. 任何人犯了法都会受到惩罚。[文章版权 禁止转载:考试与评价 s1 ?"=LY}G�oGc_T0rFroG]
(2)先行词为that， this， those或 these且指人时。如：[文章版权 禁止转载:考试与评价 9Fe}wH&gAuHY FroG]
Those who hadn't bought a ticket for the train crowded in the waiting hall. 那些未买着票的人拥挤在候车厅里。[文章版权 禁止转载:考试与评价 -=[ p=Wc e_]S}?�]FroG]
(3)当先行词在定语从句中作宾语或表语时，在口语中用who 或whom引导均可，但如直接位于介词后作宾语时，只能用whom。如：[文章版权 禁止转载:考试与评价 7S+ Eb#u?]c*bM,%zFroG]
The guest(who/whom) I'll first introduce to you is a little girl. 我首先要介绍给你们的客人是一位小姑娘。[文章版权 禁止转载:考试与评价 Qs*B-gE| ;%=PLFroG]
I met a few friends of mine， among whom was my old classmate. 我遇见了几位朋友，其中一位是我的老同学。[文章版权 禁止转载:考试与评价 oI. Z
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