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摘要：本文章简单谈了定语从句的用法，包括它的定义、作用。定语从句分为限制性定语从句和非限制性定语从句，它由关系代词和关系副词来引导，修饰前面的先行词。关系代词和关系副词在从句中可以做主语﹑宾语﹑定语﹑状语等。
关键词：定语从句 关系代词 关系副词
如果一个句子担任定语，那么这个句子就是定语从句。它具有形容词修饰功能，对前面的词语进行描绘，提供更多的信息。被修饰的词叫先行词，先行词通常是一个名词﹑名词词组或句子等。
根据定语从句与先行词关系是否紧密，它可分为限制性定语从句和非限制性定语从句两种。
引导定语从句的有：关系代词who（whom， whose），which， that和关系副词when， where， why等。关系代词在定语从句中可以做主语﹑宾语﹑定语等，关系副词在定语从句中只用做状语。例如：
As a general rule， the most successful man in life is the man who has the best information. 一般说来，生活中最成功的人是获得最佳信息的人。（the man是先行词，who是关系代词）
This is the book that（which） she is looking for.这是她正在找的那本书。（book是先行词，that是关系代词）
现略谈一谈关系代词和关系副词的作用和用法。
引导定语从句的关系代词和关系副词在先行词和定语从句之间起联系作用，它们可以作定语从句的一个成分：
一、关系代词可以作定语从句的主语、宾语或定语
1.who指人，是主格，在定语从句中作主语；whom是宾格，在定语从句中作宾语；whose是所有格，在定语从句中作定语。例如：
（1） The man who stole your car has been arrested. 偷你汽车的人已经被逮捕了。
The girl who came this morning is my cousin. 今天早上来的女孩是我的表妹。
（2） The man whom I saw told me to come here.我见到的那个人让我到这里来。
The soldier whom you want to see has already come.你要见的那名士兵已经来了。
（3）This is the student whose pronunciation is the best in our class.
这就是我们班上发音最好的学生.
The building whose windows face south was built last year.
那栋窗户朝南开的楼房是去年建的。
2.which指物，在定语从句中作主语或宾语。例如：
（1）Is this the book which she was looking for?这是她曾找的那本书吗?
This is the film which created a great sensation.这就是那部引起很大轰动的电影.
（2）The book which they sent me is very good.他们寄给我的书非常好。
The money which they found in the street is mine.他们在街上找到的钱是我的。
3.that指物，有时也指人，在定语从句中作主语或宾语。指物时，它的用法和which大致相同。例如：
（1）The man that I traveled with couldn’t speak English.和我一道旅行的人不会说英语。（that作宾语，指人）
Is this the pen that you were looking for?这是你要找的钢笔吗?（that作宾语，指物）
（2）The man that called me last night was killed this morning.昨夜给我打电话的那个人今早给人杀了。（that作主语，指人）
There is no difficulty that cannot be overcome.没有不能克服的困难。（that作主語，指物）
［注1］that和which都指事物时，一般可以通用。但在下列情况下必须用that，而不能用which:
1.先行词为all，everything，nothing，something，anything，much，little，few，none，the one等时。例如：
All that glitters is not gold.闪闪发光的未必都是金子。
Is there anything（that）I can do for you now?现在需要我为你做点什么吗?
This book contains much/little that is useful.这本书中有很多/没有多少有用的东西。
I mean the one that was bought yesterday.我指的是昨天买的那个。
2.先行词为数词或被序数词（含last）修饰时。例如：
This is the first film（that）I have seen since I came here.这是我到这里以来所看的第一部电影。
The last place they visited was the Summer Palace.他们最后参观的地方是颐和园。
Look at those presents. You can see the two that you gave me.看那些礼物，你能看见你送我的那两个吗?
3.先行词被形容词的最高级或the very， the only等所修饰时。例如：
This is the biggest apple（that）I have ever eaten.这是我所吃到的苹果中最大的一个。
She is the very thief（that）the policeman is looking for.她就是警察正在寻找的那个小偷。
Mary is the only friend（that）I have in Australia.玛丽是我在澳大利亚唯一的朋友。
4.先行词中既有人又有物时。例如：
The boy and his dog that were believed to be lost in the wood were rescued this morning. 被认为失踪在森林里的男孩和狗，今天早上已获救.。
We were deeply impressed by the teachers and schools that we had visited.我们访问过的老师和参观过的学校给我们留下了深刻的印象。
5.先行词在主句中作表语，或关系代词在从句中作表语时。例如：
This is a dictionary that will help you a lot.这是本对你很有帮助的字典。
关键词：定语从句 关系代词 关系副词
如果一个句子担任定语，那么这个句子就是定语从句。它具有形容词修饰功能，对前面的词语进行描绘，提供更多的信息。被修饰的词叫先行词，先行词通常是一个名词﹑名词词组或句子等。
根据定语从句与先行词关系是否紧密，它可分为限制性定语从句和非限制性定语从句两种。
引导定语从句的有：关系代词who（whom， whose），which， that和关系副词when， where， why等。关系代词在定语从句中可以做主语﹑宾语﹑定语等，关系副词在定语从句中只用做状语。例如：
As a general rule， the most successful man in life is the man who has the best information. 一般说来，生活中最成功的人是获得最佳信息的人。（the man是先行词，who是关系代词）
This is the book that（which） she is looking for.这是她正在找的那本书。（book是先行词，that是关系代词）
现略谈一谈关系代词和关系副词的作用和用法。
引导定语从句的关系代词和关系副词在先行词和定语从句之间起联系作用，它们可以作定语从句的一个成分：
一、关系代词可以作定语从句的主语、宾语或定语
1.who指人，是主格，在定语从句中作主语；whom是宾格，在定语从句中作宾语；whose是所有格，在定语从句中作定语。例如：
（1） The man who stole your car has been arrested. 偷你汽车的人已经被逮捕了。
The girl who came this morning is my cousin. 今天早上来的女孩是我的表妹。
（2） The man whom I saw told me to come here.我见到的那个人让我到这里来。
The soldier whom you want to see has already come.你要见的那名士兵已经来了。
（3）This is the student whose pronunciation is the best in our class.
这就是我们班上发音最好的学生.
The building whose windows face south was built last year.
那栋窗户朝南开的楼房是去年建的。
2.which指物，在定语从句中作主语或宾语。例如：
（1）Is this the book which she was looking for?这是她曾找的那本书吗?
This is the film which created a great sensation.这就是那部引起很大轰动的电影.
（2）The book which they sent me is very good.他们寄给我的书非常好。
The money which they found in the street is mine.他们在街上找到的钱是我的。
3.that指物，有时也指人，在定语从句中作主语或宾语。指物时，它的用法和which大致相同。例如：
（1）The man that I traveled with couldn’t speak English.和我一道旅行的人不会说英语。（that作宾语，指人）
Is this the pen that you were looking for?这是你要找的钢笔吗?（that作宾语，指物）
（2）The man that called me last night was killed this morning.昨夜给我打电话的那个人今早给人杀了。（that作主语，指人）
There is no difficulty that cannot be overcome.没有不能克服的困难。（that作主語，指物）
［注1］that和which都指事物时，一般可以通用。但在下列情况下必须用that，而不能用which:
1.先行词为all，everything，nothing，something，anything，much，little，few，none，the one等时。例如：
All that glitters is not gold.闪闪发光的未必都是金子。
Is there anything（that）I can do for you now?现在需要我为你做点什么吗?
This book contains much/little that is useful.这本书中有很多/没有多少有用的东西。
I mean the one that was bought yesterday.我指的是昨天买的那个。
2.先行词为数词或被序数词（含last）修饰时。例如：
This is the first film（that）I have seen since I came here.这是我到这里以来所看的第一部电影。
The last place they visited was the Summer Palace.他们最后参观的地方是颐和园。
Look at those presents. You can see the two that you gave me.看那些礼物，你能看见你送我的那两个吗?
3.先行词被形容词的最高级或the very， the only等所修饰时。例如：
This is the biggest apple（that）I have ever eaten.这是我所吃到的苹果中最大的一个。
She is the very thief（that）the policeman is looking for.她就是警察正在寻找的那个小偷。
Mary is the only friend（that）I have in Australia.玛丽是我在澳大利亚唯一的朋友。
4.先行词中既有人又有物时。例如：
The boy and his dog that were believed to be lost in the wood were rescued this morning. 被认为失踪在森林里的男孩和狗，今天早上已获救.。
We were deeply impressed by the teachers and schools that we had visited.我们访问过的老师和参观过的学校给我们留下了深刻的印象。
5.先行词在主句中作表语，或关系代词在从句中作表语时。例如：
This is a dictionary that will help you a lot.这是本对你很有帮助的字典。