N (người) + who + V 

N (vật) + which + V / S +V 

N (người) + whom + S+ V 

------------------------------------

EX1:

1. who

2. which 

3. whom 

4. which 

5. which 

EX2: 

1. Tom saw the clowns whom he liked very much.

2. The book which I'm reading is very good.

3. The person whom you saw last night lives next to me.

4. The waitress who served us dinner was friendly.

5. This is the man who gave me your address.

6. We stayed in a hotel which was very expensive.

7. She's riding on the elephant which was carried from India.

`color{orange}{~LeAiFuRuiHuiBao~}`