限定性定语从句与非限定性定语从句的区别
一、在句中作用不同
限制性定语从句不能被省略，否则句意就不完整。
非限制性定语从句与先行词关系不十分密切，只是对其作一些附加说明，不起限定制约作用。如果将非限制性定语从句省去，主句的意义仍然完整。
二、外在表现形式不同
限制性定语从句因与先行词关系密切，所以不可以用逗号将其与主句隔开；而非限制
性定语从句与先行词关系不十分密切，所以可用逗号将其与主句隔开。
例1. Do you remember the girl who taught us English?
你还记得教我们英语的那个女孩吗?
例2. Clock is a kind of instrument which can tell people time.
钟是一种能够告诉人们时间的仪器。
例3. This is the place where he used to live.
这就是他过去居住的地方。
例4. Mr. Zhang, who came to see me yesterday, is an old friend of mine.
张先生昨天来看我，他是我的一位朋友。
例5. We walked down the village street, where they were having market d
ay.
我们沿着村里的大街向前走去，村民们正在那里赶集。
析：在前三个例句中，定语从句与先行词关系密切，为限制性定语从句，不可用逗号将其与主句隔开。在后两个例句中，定语从句与先行词关系不密切，为非限制性定语从句，可用逗
号将其与主句隔开。
三、先行词内容有所不同
大多数限制性和非限制性定语从句的先行词往往为某一个词或短语，而特殊情况下非限制性定语从句的先行词也可为整个主句，此时非限制性定语从句常由which 引导。
例1. A middle-aged woman killed her husband, which frightened me very
much.
一个中年女子杀害了自己的丈夫，这令我十分恐惧。
析：由语境可知，令“我”恐惧的内容应为“中年女子杀害了自己的丈夫”这整个一件事，因此先行词为整个主句，此时应由which 引导定语从句。
例2. A five-year-old boy can speak two foreign languages, which surprises
限制性从句all the people present.
一个五岁男孩会讲两门外语，这令所有在场的人感到非常惊讶。
析：由语境可知，令所有在场的人感到惊讶的内容是“一个五岁男孩会讲两门外语”这整个一件事，因此先行词为整个主句，此时应由which 引导非限制性定语从句。
四、关系词的使用情况有所不同
(一) that 不可用于引导非限制性定语从句
所有关系代词和关系副词均可引导限制性定语从句，大多数关系代词和关系副词可
引导非限制性定语从句，但that 不可。
例1. 他送给他母亲一台彩电作为生日礼物，这使她非常高兴。
误: He gave his mother a color TV set for her birthday, that pleased her a
lot.
正: He gave his mother a color TV set for her birthday, which pleased her
a lot.
例2. 他没通过这次考试，令我很失望。
误: He didn't pass the exam, that disappointed me.
正: He didn't pass the exam, which disappointed me.
值得注意的是，不少同学误认为只有which 才能引导非限制性定语从句，这个观点是不正确的。使用非限制性定语从句时，如果先行词指人，则用who , which 或whose 引导非限制性定语从句；先行词指物可用which 引导非限制性定语从句；先行词表时间或地点且在从句中作时间状语或地点状语时，可用when , where 引导非限制性定语从句。
例1. We'll graduate in July, when we will be free.
我们将于七月份毕业，到那时我们就自由了。
例2. Last Sunday they reached Nanjing, where a conference was to be he
ld.
他们上周日到达南京，有个会议要在那里举行。
(二)关系代词替代情况不同
关系代词whom 在限制性定语从句中作宾语时可用who 代替whom ，但whom 在非限制性定语从句中作宾语时不可用who 来代替。
例1. This is the girl whom I met in the street.
这是我在街上遇到的那个女孩。
析：先行词the girl 在限制性定语从句中作宾语，可用who 代替whom .
例2. A young man had a new girl friend, whom he wanted to impress.
一个年轻的小伙子新交了一个女朋友，他想给她留下深刻的印象。
析：先行词a new girl friend 在非限制性定语从句中作宾语，不可用who 代替wh
om .
在限制性定语从句中，先行词指人时可用that 代替who/ whom ，但在非限制性定语从句中先行词指人时，不可用that 代替who/whom .
例：她有一个，她是教师。
误: She has a sister, that is a teacher.
正: She has a sister, who is teacher.
(三)关系代词省略情况不同
关系代词在限制性定语从句中作宾语时可以省去，非限制性定语从句的所有关系词
均不可省。
例1. This is the book (which/that) he lost yesterday.
这就是他昨天丢的那本书。
析：先行词the book 在限制性定语从句中作宾语，关系代词which 或that 可以省
略。
例2. The book, which he lost yesterday, has been found.
他昨天丢了这本书，但现在已到了。
析：先行词the book 在非限制性定语从句中作宾语，关系代词which 不可省。
[实战演练]
1. She heard a terrible noise, _________ brought her heart into her mouth.
A. it
B. which
C. this
D. that
2. Have you ever been to Xi'an, _________ I left ten years ago.
A. which
B. whose
C. that
D. /
3. The weather turned out to be very good, _________ was more than we
could expect.
A. what
B. which
C. that
D. it
4. His English, ________ used to be very poor is now excellent.
A. which
B. that
C. it D . whom
5. Some of the roads were flooded, __________ makes o
ur journey more difficult.
A. that
B. it
C. which
D. who
6. I'll find a nice girl, _________ I want to marry.
A. who
B. whom
C. that
D. which
7. I'll come at ten, ________ I'll be free.
A. which
B. that
C. when
D. what
8. She has two brothers, _________ are teachers.
A. who
B. that
C. whom
D. /
9. Which answer is NOT true?
This is the factory ________ I visited yesterday.
A. that
B. which
C. /
D. where
10. I still remember the days _________ I spent in Beijing.
A. when
B. what
C. that
D. during
Key:
1. B
2. A
3. B
4. A
5. C
6. B
7. C
8. A
9. D 10. C
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