1.who指人，在從句中做主語

　　(1)The boys who are playing football are from Class One.

　　(2)Yesterday I helped an old man who lost his way.

　　2. whom指人，在定語從句中充當(dāng)賓語，�？墒÷浴�

　　(1) Mr. Liu is the person (whom) you talked about.

　　注意：關(guān)系代詞whom在口語和非正式語體中常用who代替，可省略。

　　(3) The man who/whom you met just now is my friend.

　　3. which指物，在定語從句中做主語或者賓語，做賓語時可省略

　　(1) Football is a game which is liked by most boys. ( which 在句子中做主語)

　　(2) This is the pen (which) he bought yesterday. ( which 在句子中做賓語)

　　4. that指人時，相當(dāng)于who或者whom;指物時，相當(dāng)于which。

　　在賓語從句中做主語或者賓語，做賓語時可省略。

　　(5) The people that/who come to visit the city are all here. (在句子中做主語)

　　(6) Where is the man that/whom I saw this morning? (在句子中做賓語)

　　5. whose通常指人，也可指物，在定語從句中做定語

　　(1) He has a friend whose father is a doctor.

　　(2) I lived in a house whose roof has fallen in.

　　whose指物時，常用以下結(jié)構(gòu)來代替

　　(3)The classroom whose door is broken will soon be repaired.

　　=The classroom the door of which is broken will soon be repaired.

　　(5)Do you like the book whose color is yellow?

　　=Do you like the book the color of which is yellow?