1. spent
2. did not spend
3. Did he spend
4. Where did he spend
5. helped
6. did not help
7. Did she help
8. How did she help
9. cooks
10. не совсем понятно предложение, уточните, пожалуйста.
11. is cooking
12. cooked
13. do not eat
14. am not eating
15. i will not eat
16. did not eat
17. Do you go
18. Are you going
19. Will you go
20. Did you go abroad last summer (to не нужно)
21. What does your brither do every day?
22. What will your brother do tomorrow?
23. What did your brother do yesterday?