`1`. had started

`2`. had lived

`3`. had eaten

`4`. had listened

`5`. had left

`6`. had finished

`7`. had been

`8`. had met

`9`. had forgot

`10`. had studied

`11`. hadn't rained

`12`. hadn't paid

`13`. hadn't done

`14`. hadn't eaten

`15`. hadn't brought

`-----`

`***` QKHT, QKĐ: Diễn tả một hành động xảy ra trước hành động khác trong quá khứ.

`(+)` S + had + V3/ed

`(-)` S + hadn't + V3/ed

`(?)` (Wh) + Had + S + V3/ed?

`-` After QKHT, QKĐ: Sau khi

`-` Before QKĐ, QKHT: Trước khi

`-` Câu điều kiện loại `3`: If + S + had + V3/ed, S + would/could/might + have + V3/ed

`-` QKĐ because QKHT: bởi vì

1. had started

2. had lived

3. had eaten

4. hadn't listened (Câu ĐK loại 3: If + S + had + V3/ed, S + would/could + have + V3/ed)

5. had left

6. had finished

7. had been

8. had met

9. had forgotten

10. had studied

11. hadn't rained

12. hadn't paid

13. hadn't done

14. hadn't eaten

15. hadn't brought 

*Thì quá khứ hoàn thành (past perfect):

→ Cấu trúc:

(+) S + had + V3/ed

(-) S + hadn't + V3/ed (hadn't = had not)

(?) Had + S + V3/ed?

→ Diễn tả sự việc đã diễn ra trước sự việc khác trong quá khứ. Sự việc diễn ra trước dùng thì QKHT, sự việc diễn ra sau dùng thì QKĐ (S + V2/ed)