chia đọng từ trong ngoặc....

` 1`. studied

` 2`. have studied

` 3`. have watched

` 4`. watched

` 5`. traveled

` 6`. traveled

` 7`. have read

` 8`. read

` 9`. had

` 10`. have had

` --------`

` @` Quá khứ đơn

` (+)` S + V-ed/V2 + ...

` (-)` S + didn't + V-inf + ...

` (?)` Did + S + V-inf + ...?

` -` DHNB : ago, last month, last week, last year, yesterday, in the past, ...

` @` Hiện tại hoàn thành

` (+)` S + have/has + V-ed/V3 + ...

` (-)` S + have/has + not + V-ed/V3 + ...

` (?)` Have/has + S + V-inf + ...?

` -` DHNB : just, recently, lately, already, not…yet, never, ever, since, for, so far…

1. studied

2. have studied

3. have watched

4. watched

5. travelled

6. travelled

7. have read

8. read

9. had

10. have had

______________________

`*` QKĐ: (+) S + V2/ed + O

`*` HTHT: (+) S + has/have + V3/ed + O