Question

12. She mustn't marry an old man.
13. They have their own bicycles.
14. She had time to read my letter.
15. We have done our duty.
16. We must serve our country.
17. The workmen were lazy.
18. She can come here tomorrow.
19. There are twelve months in a year.
20. You have had your dinner.

change into question​

Answer 1

Explanation:

12. She must not marry an old man, isn't it?

13. Do they have their own bicycles?

14. Had she got time to read my letter?

15. Have we done our duty?

16. We must serve our country, isn't it?

17. Were the workmen lazy?

18. Can she come here tomorrow?

19. Are there 12 months in a year?

20. Have you had your dinner?

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Answer 2

1. Can't these boys understand English?
2. Mustn't she marry an old man?
3. Do they have their own bicycles?
4. Did she had time to read my letter?
5. Have we done our duty?
6. Must we serve our country?
7. Were the workmen lazy?
8. Can she come here tomorrow?
9. Are there twelve months in a year?
10. Have you had your dinner?

Hope it's helpful