1)修饰人的定语从句

　　who 主语/宾语(口语中，可省略)

　　that 主语/宾语(可省略，前面不能有介词)

　　whom 宾语(前面没有介词时可省略)

　　whose 定语

　　Do you know the person to whom he is talking?

　　Do you know the person(whom/that) he is talking to?

　　He is the man (who/whom/that) you can rely on.

　　He is the man on whom you can rely.

　　Do you know the woman who(that) is watching TV?

　　You're the only one whose advice he might listen to.

　　The girls whose names were called stood up.

　　Here is the man (whom/that) you've been looking for.

　　He is a man on whom you can safely depend.

　　2)修饰物的定语从句

　　如果修饰的词是物，而它在定语从句中做主语，则可以用that和which.

　　如果修饰的词是物，而它在定语从句中做宾语，则可以用that(可省略，前面不能有介词)和which(前面没有介词时可省略)。

　　whose后接名词做定语。

　　She wasn't on the train which /that arrived just now.

　　The dog which/that was lost has been found.

　　This is the question about which we've had so much discussion.

　　This is the question(that/which) we've had so much discussion about.

　　The novel (that/which) he recommended is worth reading.(be worth doing;值得做某事)

　　当定语从句修饰的词是不定代词，如anybody， nobody， nothing等，或是有only， very， 形容词最高级等修饰的名词时，从句的关联词往往用that ， that作从句的主语或宾语，作宾语时常被省略。

　　Is there anything (that ) I can do for you?

　　All(that) you have to do is to close the door and wait for him.

　　This is one of the easiest questions that do not need answering.

　　There is no one in the world who/that does not make a mistake.

　　定语从句修饰的词是不定代词、only、very、形容词最高级关联词用that，如果that在从句中做宾语，则可以省略。

　　3)修饰时间、地点、原因的定语从句

　　修饰时间的用when，相当于相当于“介词+ which”，在句中做状语。

　　修饰地点的用where，相当于相当于“介词+ which”，在句中做状语。

　　修饰原因的一般情况下跟的都是reason，用why关联词引导定语从句。

　　He came last night when I was going to bed.

　　I know of a place where we can have lunch.

　　She's going home where she can rest.

　　Do you know the reason why I left early?

　　There's no reason why he should do so.

　　4)非限定性定语从句 非限定性定语从句中不能用关联词that.修饰人时用who， whose， whom; 修饰物时用which， whose;修饰地点和时间的名词，且作状语时分别用where， when.如：

　　Water， which is a clear liquid， has many uses.

　　Our guide， who is a Chinese ， is an excellent cook.

　　They will fly to Boston， where they can plan to stay for four days， and then go to New York.

　　He picked up the book， the cover of which had been torn.(tear-tore-torn 撕裂、撕碎)

　　He is our English teacher， whose wife is a manager in a big firm.

　　非限定性定语从句还可以修饰整个句子，关联词只能用which.

　　The activity was postponed， which was exactly what we wanted.

　　They have invited me to attend the party， which is very kind of them.

　　限定型定语从句，如果修饰物并做宾语，前面又有介词，只能用which. 但是如果定语从句修饰的是不定代词，或是only，very以及形容词最高级，只能用that.在非限定性定语从句中修饰物只能用which，修饰人只能用who.如果非限定性定语从句修饰整个句子，关联词只能用which.

　　as 也可以引导定语从句，多和such连用。如：

　　Boy as he was， he was chosen king.

　　He was in such a fury as I have never seen.

　　Let's discuss only such questions as concern everyone of us.

　　A. while B. that C. which D. when

　　答案 D

　　2. Our concert turned out to be a great success， _______ they had never expected.

　　A. what B. that C. when D. which

　　答案 D

　　3. It was a cold winter night， and there wasn't anyone _______ the boy could turn to for help in the street.

　　A. that B. which C. whom D. what

　　答案 A

　　turn to sb. 向某人求助

　　4. All _____ is a continuous supply of fuel.

　　A. what is needed B. the thing needed

　　C. that is needed D. for their needs

　　答案 C

　　5. Huang Hong， ________ father is a taxi driver， studies computer science in the U.S.

　　A. her B. she's C. whose D. that

　　答案 C

　　6. Mr. Li is going to visit the university ________ he studied 25 years ago.

　　A. where B. which C. that D. in where

　　答案 D 正确答案 in which

　　答案 A

　　7. She had three sons， all ________ became doctors.

　　A. of which B. which C. of whom D. who

　　答案 C

　　8. The only thing _________ really matters to the children is how soon they can return home.

　　A. that B. which C. what D. /

　　答案 A

　　9. “Do you know Tom?”

　　“I think so. Isn't he _______ smokes incessantly(不停地)?”

　　A. who B. the man C. the man who D. the person which

　　答案 C

　　10. The seventeenth century was one ________ many significant advances were made in both science and philosophy.

　　A. in that B. in which C. whose D. of

　　答案 B

　　11. English words are not always spelled ________.

　　A. the way they sound B. the way they to sound

　　C. the way they're sounding D. as they are sounding

　　答案 A

　　12. Angel was the first girl ________ when you got here.

　　A. you talked to whom B. you talked to

　　C. whom you talked D. who talked you

　　A的正确答案为whom you talked to/to whom you talked to

　　答案 B

　　13. He arrived late， ________ was annoying.

　　A. what B. that C. which D. whom

　　答案 C

　　14. She was extremely understanding， _______ helped to calm James down.

　　A. which B. it C. that D. this

　　答案 A

　　15. I've never dined with you， sir; and I see no reason ________.

　　A. how should I now B. how I should now

　　C. why should I now D. why I should now

　　答案 D

　　16. The letter _______ I mailed to my sister a month before Christmas has not yet reached her.

　　A. that B. which C. / D. all of the above

　　答案 D

　　17. ________ is known to the world， Mark Twain was a great American writer.

　　A. That B. Which C. As D. It

　　答案 C