Ответ: they did theirs homework

They have done theirs homework

They are doing theirs homework

Объяснение:

Ответ:

1. They do their homework.

2. They are doing their homework.

3. They will do their homework.

4. They will be doing their homework.

5. They did their homework.

6. They were doing their homework.

7. They have done their homework.

8. They had done their homework.

9. They will have been doing their homework.

10. They will have done their homework.

11. They have been doing their homework.

12. They had been doing their homework.