（一）定語從句一般由關係代詞和關係副詞引導
1、關係代詞：who, whom, whose, which, that, as
2、關係副詞：when, where, why
關係代詞和關係副詞必須位於從句之首，主句先行詞之後，起著連線先行詞和從句的`作用， 同時在從句中又充當句子成分。
e.g. She is the girl who sings best of all.（關係代詞who在從句中作主語）
The comrade with whom I came knows French.（whom在從句中作介詞with的賓語）
3、關係代詞和關係副詞的用法：1）當先行詞為人時用who 作主語，whom作賓語；2）當先行詞為物或整個句子時用which ，可作主語或賓語；3）先行詞為人、物時用that ，可作主語或賓語；4）whose用作定語，可指人或物；5）關係副詞when（指時間，在定語從句中作時間狀語，where（指地點，在定語從句中作地點狀語），why（指原因，在定語從句中作原因狀語）。
（二）限制性定語從句與非限制性定語從句
1、限制性定語從句：從句與主句關係密切，去掉從句，主句意義不完整，甚至不合邏輯。
e.g. I was the only person in our office who was invited.（去掉定語從句，意思就不完整）
2、非限制性定語從句：從句對先行詞關係不密切，去掉定從句，意思仍然完整。形式上用逗號隔開，不能that用引導。
練習選擇題：
1. -Do you know the man ______is talking with your father？
-Yes，he's our headmaster.
A. he B. who C. which D. whom
2. Is this the river _____I can swim？
A. which B. in which C. that D. the one
3. This is the best hotel in the city _____I know.
A. where B. which C. that D. it
4. Can you lend me the dictionary ______the other day？
A. that you bought B. you bought it
C. that you bought it D. which you bought it
5. Anyone ______with what I said may put up you hands.
A. which agrees B. who agree
C. who agrees D. which agree
6. My watch is not the only thing ______ is missing.
A. that B. it C. which who
7. The man ______coat is black is waiting at the gate.
A. who’s B. whose C. that of which.
8. The girl ______ is reading under the tree _____my sister.
A. which； is B. whom； was C. who； is D. who； was
9. I love places ______the people are really friendly.
A. that B. which C. where D. who
10. The world ______ is made up of matter.
A. in that we live B. on which we live
C. where we live in D. we live in
11. Did you find the notebook ______ Jim had given me for my birthday?
A. who B. whom C. which D. whose
12. That's all ______ I have seen and heard.
A. which B. that C. where D. what
13. Have you seen the man ______ plan we were talking about ______ yesterday?
A. who, them B. its, them C. whose,/ D. whose, them
Oscar is one of the film prizes ______ offered to any Chinese actor or actress so far.
A. which are not B. that have not been
C. that has not D. that has not been
15. He never reads anything ______ is not worth reading.
A. that B. as C. who D. which
16. _________ cleans the classroom can go home first.
A. Anyone B. those who C. However D. The one who
17. The police caught the man _______ stole my handbag.
A. he B. that C. whom D. which
18. George Mallory was an English teacher _______ loved climbing.
A. who B. whom C. he D. which
參考答案
1-5BBCAC 6-10 ABCCD 11-15 CDCDA 16-18 DBA
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