Here are the sentences revised in two different ways each:

**14. They will give her a prize if she studies well.**
- **If she studies well, they will give her a prize.**
- **A prize will be given to her if she studies well.**

**15. The lawyer gave him the details of his uncle’s will.**
- **He was given the details of his uncle’s will by the lawyer.**
- **The details of his uncle’s will were given to him by the lawyer.**

**16. Pau’s mother bought him some trousers.**
- **Some trousers were bought for him by Pau’s mother.**
- **Pau’s mother purchased some trousers for him.**

**17. You don’t need to wind this watch.**
- **This watch does not need to be wound.**
- **There is no need to wind this watch.**

**18. Fashion designers have added some beautiful patterns to the “ao dai”.**
- **Some beautiful patterns have been added to the “ao dai” by fashion designers.**
- **Fashion designers have incorporated some beautiful patterns into the “ao dai”.**

**19. The clowns made the audience laugh a lot.**
- **The audience laughed a lot because of the clowns.**
- **The clowns caused the audience to laugh a lot.**