3. It is a poor dog to whom nobody pays attention.

4. Is the girl your friend with which you shook hands just now.

5. Mary is a person with whom I can discuss my problems.

6. Mr. Li is the teacher to who I can turn for help.

　7.This is the book (which/ that) I'm looking for.

　8. The babies after whom the nurse is looking are very healthy.

归纳总结: 当关系代词作 look for, look after, take care of等不能拆开使用的短语动词的宾语时,介词不能__________。

Task 2: Complete the sentences with proper preposition+ which / whom.

　1. Do you like the book ____________she spent $10?

　2. Do you like the book _____________she paid $10?

　3. Do you like the book _____________she learned a lot?

　4. Do you like the book _____________ she often talks?

　6. The film _______________ I fell asleep was very boring.

　7. The little creature___________ scientists are interested is known as ET.

　8. The gun ______________ he was shot was never found.

10. The man ___________ I spoke on the phone last night is very good at wrestling.

归纳总结: 确定介词的依据:

Step3 Extension

Task 1 Choose the correct answer.

1. American women usually identify their best friend as someone_____ they can talk frequently.(2004上海卷)

A. who B. as C. about which D. with whom

2. The English play_____ my students acted at the New Year's party was a great success. (2004 全国高考I)

A. for which B. at which C. in which D. on which