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6. The girl chatted with him yesterday. She lives next to my house. 

=> The girl, who lives next to my house, chatted with him yesterday.

7.  Do you know the girl? Tom is talking to her.

=> Do you know the girl who Tom is talking to ?

8. I have a class. It begins at 8 a.m.

=> I have a class which begins at 8 a.m.

9. I don't like the man. He is going out with my sister.

=> I don't like the man who is going out with my sister.

10. The bus isn't running today. It goes to Oxford.

=> The bus, which goes to Oxford, isn't running today.

11. Most of the people speak German. They live in Australia.

=> Most of the people, who live in Australia, speak German.

12. He was sitting on a chair. It was uncomfortable.

=> He was sitting on a chair which was uncomfortable.

13. He smokes cigarettes. They are very strong.

=> He smokes cigarettes which are very strong.

14. I am looking after some children. They are terribbly spoilt.

=> I am looking after some children who are terribbly spoilt.

15. The bed has no mattress. I sleep on this bed.

=> The bed, which I sleep on, has no mattress.

* Cấu trúc:  Who/whom/that + V + S ( chỉ người )

                    which + S + V ( chỉ vật )