(一)基本概念
1.由一个句子作定语，修饰句中一个名词或代词，有时也可以修饰整个句子或句中的部分内容，这样的从句就是定语从句，被其修饰的名词或代词叫先行词。
2.关系词分为两大类，即关系代词和关系副词，其作用一是引出一个定语从句，二是代替其所修饰的先行词，三是在句中充当某个句子成分。
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(一)基本概念
1.由一个句子作定语，修饰句中一个名词或代词，有时也可以修饰整个句子或句中的部分内容，这样的从句就是定语从句，被其修饰的名词或代词叫先行词。
2.关系词分为两大类，即关系代词和关系副词，其作用一是引出一个定语从句，二是代替其所修饰的先行词，三是在句中充当某个句子成分。
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二)定语从句的注意点
本部分的内容比较复杂，为便于考生一目了然，需要：
1.that与which, who, whom的用法区别
2.as、which和that的区别
3. where、when与why引导的定语从句
4.“介词+关系代词”引导的定语从句
当关系代词作介词宾语，且该介词不是和从句的谓语动词构成固定短语时，介词可以提前，这样就出现“介词+关系代词”。先行词指物，用“介词+which/whose”,指人则用“介词+whom/whose”, 且两个关系代词均不
5.定语从句与先行词被分割开来的现象
定语从句一般紧接被它所修饰的先行词;但有时候它和先行词之间有可能插入其他成分，使它与先行词分隔开来，这种定语从句叫作被分隔的定语从句，在阅读文章时会经常遇到这种情况，在阅读是要注意识别先行词的修饰对象。
6.定语从句与其它从句（句型）的区别
此外还要注意下列两点：
▲定语从句与习惯句型
用一个恰当的词完成下列句子，使之完整与正确。
①It is the first time _____ she has been in Shanghai.
②It was the time _____ Chinese people had a hard life.
解析：这里①小题是一个习惯句型，其结构为：It is/was the first/second ... time +that从句。故①填that，其意为：这是她第一次在上海。②小题the time是先行词，其后是表示时间的定语从句，故填 when。
▲定语从句与简单句
用一个恰当的词完成下列句子，使之完整与正确。
①The mother told the lazy boy to work，_____ didn't help.
②The mother told the lazy boy to work._____ didn't help.
解析：含有定语从句的复合句与两个单句的主要区别在于：前者有主句，有从句，必须有关系词;而后者则是两个单独的句子，不需要任何关联词。①小题两个句子用逗号连接且没有并列连词，显然应是主从句关系，因此需用关系词which，前面整个句子作先行词;②小题则填It，代替前面的整个句子。解题时，注意标点符号的运用。
【高考预测】
1. ______ is known to us all is that Shenzhou VII has launched for the first spacewalk successfully.
A. That B. What C. It D. As
2. Barack Obama delivered a speech to 500 local youths during his visit to China, many of _______ were from
Fudan University and Tongji University.
A. them B. whom C. which D. those
3.Most of us still wonder _______ it is _______ makes those honest peasant workers, without being paid at all, resign themselves to the bosses.
A. what; that B. /; what C. that; what D. /; that
4. — Join us in the party tonight, would you?
— Sorry, I’m afraid I can’t, ______ I ______ the content of some reports with my boss.
A. for; have discussed B. because; will be discussing
C. before; discussed D. when; will have discussed
5.—I’m going to New York for further studies next term.
—Congratulations! ________ you’re there, can you keep me e-mailed?
A. As B. While C. Because D. If
6. Probably no man had more effects on the daily lives of people in the United States ________ Henry Ford ________.
A. as; was B. than; was C. than; did D. as; did
7. There are a lot of students in the reading room, most of with their eyes on and their heads bent over their books.
A.whom; fixing B.them; fixed C.whom; fixed D.them; fixing
8. Young people who have got jobs may realize university lessons can’t be the only preparation for all of the situations ________ appear in the working world.
A. where B. when C. that D. what
9. Faced with challenges, you should believe your courage is __________ makes a difference.
A. that B. what C. which D. whatever
10. —Do you have any idea of rugby?
—Abosolutely. It is a sport ______ players hold the ball and run with it.
A. which B.when C.why D.where
11. What was it _________ caused the modem nations to change their mind _________ they should help to preserve the Roma’s history?
A. /; why B. that; that C. that; / D. what; that
12. We went to the Lincoln Memorial yesterday, , not surprisingly, was crowded with visitors from all over the world. A.where B.which C.that D.when
13. It was the very place _________ the soldiers fought over sixty years ago.
A. that B. which C. where D. there
14. Hardly ______ when the bus suddenly pulled away.
A. they had got to the bus stop B. they got to the bus stop
C. did they get to the bus stop D. had they got to the bus stop
15. After the new technique was introduced, the factory produced______ tractors in 1998 as the year before.
A. as many twice B. as twice as many C. twice as many D. twice as many as
16. You can fly to UK this morning _____ you don’t mind changing planes in Hong Kong.
A. because B. provided C. unless D. so far as
17. It’s the same in China---many people, _____some are not overweight at all, are always going on diets
or taking weight-loss pills, ______ are often dangerous.
A. whose; which B. of which; who C. of whom; which D. who; that
18. Is _________ 48 hours _________ the man-ma
本部分的内容比较复杂，为便于考生一目了然，需要：
1.that与which, who, whom的用法区别
2.as、which和that的区别
3. where、when与why引导的定语从句
4.“介词+关系代词”引导的定语从句
当关系代词作介词宾语，且该介词不是和从句的谓语动词构成固定短语时，介词可以提前，这样就出现“介词+关系代词”。先行词指物，用“介词+which/whose”,指人则用“介词+whom/whose”, 且两个关系代词均不
5.定语从句与先行词被分割开来的现象
定语从句一般紧接被它所修饰的先行词;但有时候它和先行词之间有可能插入其他成分，使它与先行词分隔开来，这种定语从句叫作被分隔的定语从句，在阅读文章时会经常遇到这种情况，在阅读是要注意识别先行词的修饰对象。
6.定语从句与其它从句（句型）的区别
此外还要注意下列两点：
▲定语从句与习惯句型
用一个恰当的词完成下列句子，使之完整与正确。
①It is the first time _____ she has been in Shanghai.
②It was the time _____ Chinese people had a hard life.
解析：这里①小题是一个习惯句型，其结构为：It is/was the first/second ... time +that从句。故①填that，其意为：这是她第一次在上海。②小题the time是先行词，其后是表示时间的定语从句，故填 when。
▲定语从句与简单句
用一个恰当的词完成下列句子，使之完整与正确。
①The mother told the lazy boy to work，_____ didn't help.
②The mother told the lazy boy to work._____ didn't help.
解析：含有定语从句的复合句与两个单句的主要区别在于：前者有主句，有从句，必须有关系词;而后者则是两个单独的句子，不需要任何关联词。①小题两个句子用逗号连接且没有并列连词，显然应是主从句关系，因此需用关系词which，前面整个句子作先行词;②小题则填It，代替前面的整个句子。解题时，注意标点符号的运用。
【高考预测】
1. ______ is known to us all is that Shenzhou VII has launched for the first spacewalk successfully.
A. That B. What C. It D. As
2. Barack Obama delivered a speech to 500 local youths during his visit to China, many of _______ were from
Fudan University and Tongji University.
A. them B. whom C. which D. those
3.Most of us still wonder _______ it is _______ makes those honest peasant workers, without being paid at all, resign themselves to the bosses.
A. what; that B. /; what C. that; what D. /; that
4. — Join us in the party tonight, would you?
— Sorry, I’m afraid I can’t, ______ I ______ the content of some reports with my boss.
A. for; have discussed B. because; will be discussing
C. before; discussed D. when; will have discussed
5.—I’m going to New York for further studies next term.
—Congratulations! ________ you’re there, can you keep me e-mailed?
A. As B. While C. Because D. If
6. Probably no man had more effects on the daily lives of people in the United States ________ Henry Ford ________.
A. as; was B. than; was C. than; did D. as; did
7. There are a lot of students in the reading room, most of with their eyes on and their heads bent over their books.
A.whom; fixing B.them; fixed C.whom; fixed D.them; fixing
8. Young people who have got jobs may realize university lessons can’t be the only preparation for all of the situations ________ appear in the working world.
A. where B. when C. that D. what
9. Faced with challenges, you should believe your courage is __________ makes a difference.
A. that B. what C. which D. whatever
10. —Do you have any idea of rugby?
—Abosolutely. It is a sport ______ players hold the ball and run with it.
A. which B.when C.why D.where
11. What was it _________ caused the modem nations to change their mind _________ they should help to preserve the Roma’s history?
A. /; why B. that; that C. that; / D. what; that
12. We went to the Lincoln Memorial yesterday, , not surprisingly, was crowded with visitors from all over the world. A.where B.which C.that D.when
13. It was the very place _________ the soldiers fought over sixty years ago.
A. that B. which C. where D. there
14. Hardly ______ when the bus suddenly pulled away.
A. they had got to the bus stop B. they got to the bus stop
C. did they get to the bus stop D. had they got to the bus stop
15. After the new technique was introduced, the factory produced______ tractors in 1998 as the year before.
A. as many twice B. as twice as many C. twice as many D. twice as many as
16. You can fly to UK this morning _____ you don’t mind changing planes in Hong Kong.
A. because B. provided C. unless D. so far as
17. It’s the same in China---many people, _____some are not overweight at all, are always going on diets
or taking weight-loss pills, ______ are often dangerous.
A. whose; which B. of which; who C. of whom; which D. who; that
18. Is _________ 48 hours _________ the man-ma