=>
1. The girl who chatted with you yesterday is my cousin.
2. The man who spent 15 minutes measuring our kitchen is very kind.
3. The architect who designed these flats has moved to HCM City.
4. The young boy who rides an expensive motorbike is naughty.
5. I'm reading the book which I bought in 1996.
6. Do you know the man who is sharing the flat with me?
7. The young man who is talking to our teacher is Ba's brother.
8. We visited the monument which was built a hundred years ago.
9. The boys are interested in the game which is a popular game all over the world.
10. You have no need to tell me the reason why you are often late for work.
Who -> đtqh chỉ người
Which -> đtqh chỉ vật
Why -> đtqh chỉ lý do