限制性定语从句和非限制性定语从句讲解

1、限制性定语从句和非限制性定语从句限制性定语从句和非限制性定语从句有四大区别，现作简要介绍。一、在句中作用不同限制性定语从句对被修饰的先行词有限定制约作用，使该词的含义更具体，更明 确。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。1. Do you remember the girl who taught us

2、 English?2. Clock is a kind of instrument which can tell people time.3. This is the place where he used to live.4. Mr. Zhang,who came to see me yesterday,is an old friend of mine.5. We walked down the village street,where they were having market day.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

3、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白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.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

4、speak two foreign languages,which surprises all the people present.析:由语境可知,令所有在场的人感到惊讶的内容是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 h

5、er 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wh

6、o , 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 held.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

7、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 whom .在限制性定语从句中，先行词指

8、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:她有一个姐姐，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/thathe lost yesterday.这就是他昨大丢的那本书。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

9、以省 略。例 2. The book,which he lost yesterday,has been found.他昨天丢了这本书，但现在已找到了。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。1. She heard a terrible noise,brought her heart into her mouth.A. itB. whichC. thisD. that2. Have you ever been to Xi'an,I left ten years ago.B. whoseC. thatD. /3. The weather turne

10、d out to be very good,was more than we could expect.A. whatB. whichC. thatD. it4. His English,used to be very poor is now excellent.A. whichB. thatC. it D . whom5. Some of the roads were flooded,makes our journey more difficult.A. thatB. itC. whichD. who6. I'll find a nice girl,I want to marry.B. whomC. thatD. which7. I'll come at ten,I'll be free.A. whichB. thatC. whenD. what8. She has two brothers,are teachers.A. whoB. thatC. whomD. /9.