1) This is the boy who had an accident.
2) Yesterday I saw a car which was really old.
3) Mandy is the girl I met on Friday.
4) I haven't seen Frank, whose brother is five, for a long time now.
5) The robber stole the car the lady parked in front of the supermarket.
6) This is the man whose house is on fire.
7) Can I talk to the girl who is sitting on the bench?
8) The book you gave me is great.
9) She likes hamburgers which are hot.
10) Bill Clinton, who was President of the USA, has only one daughter.