定语从句是中学英语语法中的重点内容，也是高考中常考查的一个考点。掌握定语从句的用法，必须突破以下六道难关：

一. 选准关系代词和关系副词
在定语从句中，关系代词或关系副词都代替先行词在从句中充当一定的成分，如果该从句中缺少主语、表语、宾语或定语，就要用关系代词来连接从句；如果从句中缺少状语，就得用关系副词来连接从句。例如：
（1）I still remember the days which / that we spent together .
（2）I still remember the days when we worked together .

二. 了解仅用that 引导限制性定语从句的几种情况
that 在限制性定语从句中既可指人又可指事或物。在下列情况下，只能用that 来引导定语从句：
1. 先行词是all , much , few , little , everything , anything , nothing 等不定代词时。例如：
Is there anything that you want to buy ?
2. 先行词被all , few , little , much , every , some , no 等词修饰或被the only , the very , the same , the last 等限定词修饰时。例如：
These are all the pictures that I have seen .
This is the very dictionary that is of great help .
3. 先行词既指人又指物时。例如：
My father and his teacher talked a lot about the things and the persons that they could remember .
4. 关系代词在定语从句中作表语时。例如：
Our school is not the one that it used to be .
5. 先行词被形容词最高级或序数词修饰时。例如：
This is the best English film that I have ever seen .
The first English novel that I read was A Tale of Two Cities .
6. 主句是who 或which 引导的特殊问句时。例如：
Who is the girl that is standing under the tree ?
Which is the machine that we used last Sunday ?

三. 把握“介词＋关系代词”结构中介词的选用
介词的选择与主句中先行词的搭配密切相关。例如：
That”s the reason for which he was late for school .
This is the book on which I spent 8 yuan .
注意：
1. 定语从句中谓语动词是含有介词的动词短语时，介词应放在动词之后，不能拆开放在关系代词前。例如：
This is the key which you are looking for .
This is the baby whom you will look after.
2. 该结构中，关系代词指人时用whom，指物时用which .

四. 弄清as 和which 引导的非限制性定语从句指代整体时的区别
1. 位置上的区别：as 引导的非限制性定语从句的位置比较灵活，可以放在主句前，也可以放在主句后，还可插在主句的中间；而which 引导的非限制性定语从句只能放在主句之后。例如：
As is known to us all , the earth turns around the sun .
The earth , as is known to us all , turns around the sun .
The earth turns around the sun , as is known to us all .
The earth turns around the sun , which our parents once told us when we were very young .
2. 词义与联系上的区别：as 引导的非限制性定语从句与主句之间有着较为密切的上下文联系，as 本身含有“正如”之意；而which 引导的非限制性定语从句与主句之间在逻辑意义上近似并列句，which 本身表示“这”或“这一点”之意。例如：
Light travels faster than sound , as we all know .
Jack came late for school , which made his teacher angry .

五. 注意定语从句的主谓一致性
关系代词在定语从句中作主语时，从句的谓语必须与先行词保持人称和数的一致。例如：
Tom is one of the boys who are from the USA.
Tom is the only one of the the boys who is from the USA.

六. 保持主句的完整性并避免从句成分的重叠
1. 在定语从句中，不管出现任何情况，主句的结构必须完整，即主句必须有主语和谓语，缺一不可，否则，整个主从复合句就无法成立。试比较：
（1）Is this factory _____________ we visited last week ?
（2）Is this the factory ____________ we visited last week ?
A. which B. where C. what D. the one
分析：
第一题缺少表语，只有填D项才能保持主句的完整性，而其他的选项均为干扰项。
第二题主句本身完整，应填的关系代词在从句中作visited 的宾语，故应选A项。
2. 从定语从句中，关系代词或关系副词已经代替先行词独立地或与相应的介词一起在定语从句中充当了一定的成分，因此在定语从句中就不能再出现与关系代（副）词重叠的成分。例如：
错句：Is this the train that they took it last Sunday ?
分析：该题中that 已经代替先行词the train 在定语从句中充当及物动词took 的宾语，故重叠出现的宾语it必须删去。
总之，只要突破了以上六道难关，定语从句中的难题便会迎刃而解

定语从句练习50题

知识过关 

 1  Do you still remember the day ___________ I first came to Beijing?
1）A. which B. that C. when D. where   2）A. where  B. that   C. which  D. what
2  I’m going to visit the school _________ my mother taught physics ten years ago.
3  She was not the woman _________ she was before. A. what  B. that   C. who   D. as
4  In the dark street, there wasn’t a single person _________ they could turn for help.
A. whom   B. who    C. to whom    D. from whom
5  A paper plant is __________ paper is made.  A. which  B. where  C. what  D. in which
6  They stayed with me for three weeks, __________ they drank all the wine I had.
A. which   B. which time  C. during which time  D. during which
7. ---- How do you like the cake?   ---- It’s quite different from _________ I had last month.
A. that   B. which    C. the one    D. the one what
8. The Nile, ___________electricity is produced, no longer destroys villages and crops.
A. which   B. from which   C. from it    D. from that
9. In the 1950s, _________ blacks didn’t have equal rights, a lot of marches took place.
A. when  B. that    C. which   D. from which
10. Bob’s father, ____________, spent four years in Egypt.  A. that worked on the project     B. he worked on the project C. who worked on the project   D. whom worked on the project
11. The retiring teacher made a speech _________ she thanked the class for the gift.
A. which   B. of which   C. in which    D. that
12. He has to work on Sundays, __________ he does not like.
A. and which  B. which  C. and when   D. when
13.Which of the two cows ______________you keep produces more milk?
A. that   B. which   C. whom   D. when
14. He paid the boy US $10 for washing ten windows, most ___________ hadn’t been cleaned for at least year.          A. these   B. those   C. that     D. of which
15. The boys, ___________ could not reach the shelf, went to look for something to stand on.
A. the tall of whom   B. the tallest of whom  C.  the tallest one  D. the tallest of them
16. Rabbits make their homes in fields _________ hide their young under bushes or among tall grasses.       A. can where they   B. where they can  C. where can they  D. where can
17. Is this the factory ______ color TV sets are produced? A. that B. which C. in which D. in that
18. Who is that comrade _______ was there?    A. whom   B. that  C. which   D. whose
19. This is Mr Smith, __________ I think has something interesting to tell you.
19）A. who B. whom C. which D. whose    20）A. what B. that  C. who  D. which
20. Mother bought me a dictionary on my birthday, ________made me very happy.

仿真训练

 1  She wore a heavy fur coat in such a hot day, ___________ I found quite strange.
1）A. which B. that C. what D. when   2）A. in which B. at which C. of which D. from which
2  China has hundreds of islands,_____________ the largest is Taiwan.
3  We came to a place ____________ they had never paid a visit before.
3）A. to where B. to which C. that D. which   4）A. since B. which C. that  D. when
4  It was twelve o’clock ______they finished the work. 5）A. whom B. whoC. when D. because
5  He often helps the students __________ he thinks are not quick at their studies.
6 Is there a restaurant around ____I have something to eat?A. that B. what C. which D. where
7 It was at the school _________ was named after a hero _____________ he spent his childhood.    A. which; that   B. where; where   C. that; where   D. which; where
8 Look at the watch. Don’t you see it is _______ watch ________ Helen lost the other day?
A. as the same; as  B. the  same; as   C. the same; which     D. as the same ; that
9 There is a popular belief among parents ___________ schools don’t pay any attention to handwriting.       A. whose   B. that   C. which   D. in which
10 ---- Was _______Bill, _____________ played football well, _________ helped the blind man cross the road?       ---- Yes, you are right. He is always ready to help others.
A. it; that; who  B. which; that; that   C. it; who; that     D. who; which; that
11 His sister has become a teacher, ___was what she wanted to be.A. whoB. whatC. thatD. which
12 In the open boat, the four men, _________ was a doctor, met with a storm on the sea.
A. one of which  B. one of who  C. one of whom   D. one of them
13. His glasses, ________ he was like a blind man, fell to the ground and broke.
A. which  B. from which  C. with which  D. without which
14. The look, the cover ________ is broken, is not mine. A. of it  B. for  C. whose  D. of which
15 The great trouble he __________ show us how to run the machine _______ him completely tired.                A. what   B. which   C. that   D. all that
16 (1995 上海) In the office I never seem to have time until 5:30 p.m.,__________ many people have gone home.       A. whose time  B. that   C. on which   D. by which time
17. Not only _________ the car he __________ been sold by his son for gambling debts, but also   his new house.    A. /; has   B. has; had   C. has; has   D. was ; has
18. The theory he’s stuck ________ us that earthquakes can be forecast.
A, to prove to  B. to proves to  C. proves to   D. which proved
19. The high building ______ is a big hotel.
A. we are looking at it   B. we looking  C. at that we are looking   D. we are looking at
20. The baby _________is not hers.    A. of that she is taking good care  B. who she is taking good care    C. of who she is taking good care  D. whom she is taking good care of
21  (2001) The film brought the hours back to me ______ I was taken good care of in that far-away village. 1）A. until B. that C. when D. where   2）A. It B. As C. That D. What
22 2001) ________ is known to everybody, the moon travels round the earth once every month.
23 (1994) The weather turned out to be very good, _____ was more than we could expect.
A. what   B. which   C. that   D. it
24 (1996) After living in Paris for fifty years he returned to the small town, _______ he grew up as a child.    A. which   B. where   C. that   D. when
25 (1998) He made another wonderful discovery, ________ of great importance to science.
A. which I think is   B.which I think it is  C. which I think it    D. I think which is
26 (1999) --- I drove to Zhuhai for the air show last week.
      --- Is that the reason_______ you had a few days off? A. whyB. whenC. whatD. where
27 (1992) In the dark street, there wasn’t a single person _______ she could turn for help.
A. that   B. who   C. from whom    D. to whom
28 (1997上海) All of the flowers now raised here have developed from those ________ in the forest .  A. once they grew  B. they grew once   C. that once grew  D. once grew
29. (1999) Carol said the work would be done by October, _____ personally  I doubt very much. 30(1993上海) I don’t like __________ you speak to her. 29）A. it B. that C. when D. which
A. the way   B. the in that  C. the way which   D. the way of which