Ответ:

1) wrote

2) bought

3)  have already washed

4) have never painted

5) has just ate

6) went

7) caught

8) did not buy

9) have just helped

10) baked

11) has already washed

12) lived

13) came back

14) wrote

15) sent

16) have just bought

Объяснение:

Извините, я не знаю точного правила, просто говорю на английском каждый день, уже не задумываюсь. Я бы сказала так - если есть слова как just, already, never - present simple, а так past simple.