I. 

1. drank, drunk

2. stop, stopped

3. go, went

4. buy, bought

5. read, read

6. do, done

7. ate, eaten

8. play, played

9. thought, thought

10. drive, driven

11. bring, brought

12. cut, cut

II. 

1. has played

2. has, eaten

3. haven't driven

4. Have, done

5. has brought

6. Has, cut

7. hasn't thought

8. has, read

9. have bought

10. Have, drunk

11. hasn't gone

*Cấu trúc thì hiện tại hoàn thành:

(+) S + has/ have + V_ed/ V3

(- ) S + has/ have + not + V_ed/ V3

(? ) Has/ Have + S + V_ed/ V3?

*Dấu hiệu nhận biết: yet, ever, already, never, since, for + khoảng thời gian, just,...