Ответ:

1. Kate cooks dinner every day.

2. Kate will cook dinner tomorrow.

3. Kate is cooking dinner now.

4. Kate cooked dinner yesterday.

5. I do not eat ice-cream every day.

6. I am not eating ice-cream now.

7. I will not eat ice-cream tomorrow.

8. I did not eat ice-cream yesterday.

9. He spent last summer in the country.

10. He did not spend last summer in the country.

11. Did he spend last summer in the country?

12. Where did he spend last summer?

13. She helped mother yesterday.

14. She did not help mother yesterday.

15. Did she help mother yesterday?

Объяснение:

При определении нужного времени ориентируемся на слова - маркеры времени в предложении:

Present Simple - every day

Present Continuous - now

Future Simple - tomorrow

Past Simple - yesterday, last summer

Объяснение:

1) Kate cooks dinner every day.

2) Kate will cook dinner tomorrow.

3) Kate is cooking dinner now.

4) Kate cooked dinner yesterday.

5) I do not eat ice-cream every day.

6) I am not eating ice-cream now.

7) I will not eat ice-cream tomorrow.

8) I did not eat ice-cream yesterday.

9) He spent last summer in the country.

10) He did not spend last summer in the country.

11) Did he spend last summer in the country?

12) Where did he spend last summer?

13) She helped mother yesterday.

14) She did not help mother yesterday.

15) Did she help mother yesterday?