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定语从句是英语语法的难点之一，其中非限制性定语从句更令同学们难以把握。笔者从非限制性定语从句与限制性定语从句的区别出发，讨论关于非限制性定语从句的常见易错题目的解答方法。
1. 引导限制性定语从句时，关系代词which可以与that互换；但引导非限制性定语从句时，只能用which。
例1She heard a terrible noise,
______ frightened her.
A. that B. which
C. what D. who
例2She heard a terrible noise
______ frightened her.
A. that B. /
C. what D. who
解析： 例1意为：“她听到一个可怕的声音，这使她感到恐惧。”that不能用于引导非限制性定语从句，故选B。例2意为：“她听到了一个使她恐惧的可怕声音。”引导修饰noise的限制性定语从句可以用which或that来引导,故选A。
2. 先行词为reason时，限制性定语可以用why或for which来引导；非限制性定语从句则只能用for which来引导。
例3I had told them the reason, ______ I didn’t attend the meeting.
A. for which B. at which
C. for whom D. why
例4I had told them the reason ______ I didn’t attend the meeting.
A. when B. which
C. why D. for that
解析： 例3意为：“我早已把理由告诉他们，于是我没有出席会议。”先行词为reason时，非限制性定语从句应用for which引导，故选A。例4意为：“我已经把为什么没有出席会议的原因告诉他们。”the reason why...是常见搭配，答案为C。
3. 引导限制性定语从句的关系代词在从句中担任宾语时可以被省略；但引导非限制性定语从句的关系代词即使作宾语也不能省略。
例5He was eager to go to the hospital to see his stepmother,______ he loved and respected as his own mother.
A. as B. which
C. / D. whom
解析： 本句意为：“他急于去医院看望他的继母，他像对待亲生母亲一样孝敬她。”关系代词whom引导非限制性定语从句并作宾语，不能被省略，故选D。
4．引导限制性定语从句时并作从句宾语的关系代词whom可以用who来代替；但在非限制性定语从句中，whom就不能用who替换。
例6Do you know Tom, _____ we talked about?
A. which B. that
C. whom D. who
例7The American journalist ______ the announcer mentioned in the news broadcast is said to have been killed by the gangsters. Which of the following is wrong?
A. who B. whom
C. whose D. /
解析： 例6意为：“你认识汤姆吗? 我们谈到过他。”应选C。例7意为：“播音员在新闻广播中提到的那位美国记者据说已遭歹徒杀害。下列哪一项是错误的？”关系代词作mentioned的宾语且指人时，可用who/whom/that，在限制性定语从句中可省略，故C是错的。
5．当非限制性定语从句修饰整个主句时，其关系代词只能用as ，不能用which。此时非限制性定语从句可置于主句之前、之后或之中。
例8______ I expected, he didn’t believe me.
A. Which B. As
C. That D. When
解析： 本句意为：“正如我所预料的那样，他不相信我的话。”非限制性定语从句修饰整个主句，应用as引导，故答案为B。
例9Mary was late for school,______ often happened.
A. as B. for which
C. that D. why
解析： 本句意为：“玛丽上学迟到了，这是常有的事。”根据句意，关系代词as引导的非限制性定语从句修饰前面的主句，其位置非常灵活，故答案为A。
6. 由“介词 关系代词”引导非限制性定语从句，关系代词指代整个主句时，不能用as，只能用which。
例10He bought the car for more than $20,000,______ his father was angry.
A. about that B. with as
C. when D. with which
解析： 本句意为：“他花两万多美元买了这辆车，他父亲对此很生气。”which位于介词with的后面，指代前面的主句，故答案为D。
【练习题】
1. He was very rude to the customs officer, ______ of course made things even worse.
A. which B. whom
C. what D. who
2. The old lady,______ had been killed in the war, was given help by the local government.
A. all her children
B. all of her children
C. all of whose children
D. whose all children
3. Living in the central Australia desert has its problems,______ getting water is not the least.
A. of which B. for what
C. as D. whose
4. It rained hard yesterday, ______ prevented me from going to the park.
A. that B. it
C. as D. which
5. The youngest nurse has worked for 30 days in the SARS hospital,
______ she spent her 19th birthday．
A. that B. which
C. where D. and
6. Recently I bought an ancient Chinese vase,______ was very reasonable.
A. which price
B. the price of which
C. its price
D. the price of whose
7. The Beatles,______ many of you are old enough to remember, came from Liverpool.
A. what B. that
C. how D. as
8. There are libraries for grown-
ups and libraries for children ______ you can borrow books to read.
A. which B. whom
C. from which D. from whom
9. The owner of the cinema need-
ed to make a lot of improvements and employ more people to keep it running,______ meant spending tens of thousands of pounds.
A. who B. that
C. as D. which
10.______ is known to everybody, the moon travels round the earth once every month.
A. It B. As
C. That D. What
11. Look out! Don’t get too close to the house,______ the roof is under repair.
A. whose B. which
C. of which D.what
12. We saw several natives advancing towards our party, and one of them came up to us,______ we gave some bells and glasses.
A. to whom B. to which
C. with whom D. with which
13.______ has been announced, we shall have our final examination next month.
A. That B. What
C. It D. As
14. Alice received an invitation from her boss,______ came as a surprise.
A. it B. that
C. which D. he
15. The weather turned out to be very good, ______ was more than we could expect.
A. what B. as
C. that D. it
1. 引导限制性定语从句时，关系代词which可以与that互换；但引导非限制性定语从句时，只能用which。
例1She heard a terrible noise,
______ frightened her.
A. that B. which
C. what D. who
例2She heard a terrible noise
______ frightened her.
A. that B. /
C. what D. who
解析： 例1意为：“她听到一个可怕的声音，这使她感到恐惧。”that不能用于引导非限制性定语从句，故选B。例2意为：“她听到了一个使她恐惧的可怕声音。”引导修饰noise的限制性定语从句可以用which或that来引导,故选A。
2. 先行词为reason时，限制性定语可以用why或for which来引导；非限制性定语从句则只能用for which来引导。
例3I had told them the reason, ______ I didn’t attend the meeting.
A. for which B. at which
C. for whom D. why
例4I had told them the reason ______ I didn’t attend the meeting.
A. when B. which
C. why D. for that
解析： 例3意为：“我早已把理由告诉他们，于是我没有出席会议。”先行词为reason时，非限制性定语从句应用for which引导，故选A。例4意为：“我已经把为什么没有出席会议的原因告诉他们。”the reason why...是常见搭配，答案为C。
3. 引导限制性定语从句的关系代词在从句中担任宾语时可以被省略；但引导非限制性定语从句的关系代词即使作宾语也不能省略。
例5He was eager to go to the hospital to see his stepmother,______ he loved and respected as his own mother.
A. as B. which
C. / D. whom
解析： 本句意为：“他急于去医院看望他的继母，他像对待亲生母亲一样孝敬她。”关系代词whom引导非限制性定语从句并作宾语，不能被省略，故选D。
4．引导限制性定语从句时并作从句宾语的关系代词whom可以用who来代替；但在非限制性定语从句中，whom就不能用who替换。
例6Do you know Tom, _____ we talked about?
A. which B. that
C. whom D. who
例7The American journalist ______ the announcer mentioned in the news broadcast is said to have been killed by the gangsters. Which of the following is wrong?
A. who B. whom
C. whose D. /
解析： 例6意为：“你认识汤姆吗? 我们谈到过他。”应选C。例7意为：“播音员在新闻广播中提到的那位美国记者据说已遭歹徒杀害。下列哪一项是错误的？”关系代词作mentioned的宾语且指人时，可用who/whom/that，在限制性定语从句中可省略，故C是错的。
5．当非限制性定语从句修饰整个主句时，其关系代词只能用as ，不能用which。此时非限制性定语从句可置于主句之前、之后或之中。
例8______ I expected, he didn’t believe me.
A. Which B. As
C. That D. When
解析： 本句意为：“正如我所预料的那样，他不相信我的话。”非限制性定语从句修饰整个主句，应用as引导，故答案为B。
例9Mary was late for school,______ often happened.
A. as B. for which
C. that D. why
解析： 本句意为：“玛丽上学迟到了，这是常有的事。”根据句意，关系代词as引导的非限制性定语从句修饰前面的主句，其位置非常灵活，故答案为A。
6. 由“介词 关系代词”引导非限制性定语从句，关系代词指代整个主句时，不能用as，只能用which。
例10He bought the car for more than $20,000,______ his father was angry.
A. about that B. with as
C. when D. with which
解析： 本句意为：“他花两万多美元买了这辆车，他父亲对此很生气。”which位于介词with的后面，指代前面的主句，故答案为D。
【练习题】
1. He was very rude to the customs officer, ______ of course made things even worse.
A. which B. whom
C. what D. who
2. The old lady,______ had been killed in the war, was given help by the local government.
A. all her children
B. all of her children
C. all of whose children
D. whose all children
3. Living in the central Australia desert has its problems,______ getting water is not the least.
A. of which B. for what
C. as D. whose
4. It rained hard yesterday, ______ prevented me from going to the park.
A. that B. it
C. as D. which
5. The youngest nurse has worked for 30 days in the SARS hospital,
______ she spent her 19th birthday．
A. that B. which
C. where D. and
6. Recently I bought an ancient Chinese vase,______ was very reasonable.
A. which price
B. the price of which
C. its price
D. the price of whose
7. The Beatles,______ many of you are old enough to remember, came from Liverpool.
A. what B. that
C. how D. as
8. There are libraries for grown-
ups and libraries for children ______ you can borrow books to read.
A. which B. whom
C. from which D. from whom
9. The owner of the cinema need-
ed to make a lot of improvements and employ more people to keep it running,______ meant spending tens of thousands of pounds.
A. who B. that
C. as D. which
10.______ is known to everybody, the moon travels round the earth once every month.
A. It B. As
C. That D. What
11. Look out! Don’t get too close to the house,______ the roof is under repair.
A. whose B. which
C. of which D.what
12. We saw several natives advancing towards our party, and one of them came up to us,______ we gave some bells and glasses.
A. to whom B. to which
C. with whom D. with which
13.______ has been announced, we shall have our final examination next month.
A. That B. What
C. It D. As
14. Alice received an invitation from her boss,______ came as a surprise.
A. it B. that
C. which D. he
15. The weather turned out to be very good, ______ was more than we could expect.
A. what B. as
C. that D. it