Решение:
Поставим глаголы в Past Simple:
- I do — I did
- I have — I had
- I write — I wrote
- I go — I went
- I drink — I drank
- he runs — he ran
- it eats — it ate
- you do — you did
- she reads — she read
- he begins — he began
- it sings — it sang
- it swims — it swam
Ответ: 1. did; 2. had; 3. wrote; 4. went; 5. drank; 6. ran; 7. ate; 8. did; 9. read; 10. began; 11. sang; 12. swam.