cấu trúc past simple ( quá khứ đơn )

(+) S + ved + ...

(-) S + didn't + v ..

(?) Did +s +v ...? 

dấu hiệu nhận biết : ago, yesterday , in + năm qk , ..

cấu trúc past perfect ( quá khứ )

(+)  S + had +p2 

( -) S + had + not + p2 

(?) Had + s+p2 

dấu hiệu nhận biết :Until then, by the time, prior to that time, before, after, for, as soon as ,by , before, after, when by, by the time, by the end of + time in the past …

2. had gone / had done ( after - quá khứ hoàn thành )

3. had getten ( by the time - qk hoàn thành )

4. had just finished ( just - qk hoàn thành ) / rang ( when - qk đơn )

5. had already had ( already - qk hoàn thành ) / got up ( when - qk đơn )

6. had learnt - was 

7. had just come - met 

8. had arived - esscoped