1. We have collected stamps since 2013.

2. Mr.Nam's car is washed by him every week.

3. The bridge was repaired.

4. These boxes will be taken.

5. I wish I went to the party.

6. He has written the novel for 3 weeks.

7. That letter ought to be sent. 

8. Tennis was played by the boys last Sunday.

9. You are going to be met tomorrow.

10. I wish I had the key.

11. I wish Ann was here.

12. Her room has been cleaned.

13. Uniform must be worn by Mary.

14. I wish the weather was better today.

15. Peter is always helped with his homework.

16. The trees are planted by my father in the garden.

17. The work has to be finished by Ba in time. 

18. A new book has been written. 

19. She might be seen in Nam's birthday party.

20. I wish I wasn't so short.