`1,` had worried - heard

`2,` was - had thought

`3,` had shot

`4,` drank - had finished

`5,` had - folded - opened - entered

`6,` had brought

`7,` had worked - decided

`8,` arrived - had - gone

`9,` had waited - finished

`10,` had left - finished

`11,` had bought - went

`12,` had - turned off - rang

`**` Trong quá khứ, hành động xảy ra trước chia QKHT, hành động xảy ra sau chia QKĐ

* Quá khứ đơn

`(+)` S + Ved/ V2

`(-)` S + did not/ didn't + V (bare)

`(?)` (WH-word) + did + S + V (bare) ?

* Quá khứ hoàn thành

`(+)` S + had + PII

`(-)` S + had not/ hadn't + PII

`(?)` Had + S + PII?

`**` Thì QKHT được dùng trong mệnh đề if trong câu điều kiện loại 3

`**` Nhấn mạnh hành động này là nguyên nhân dẫn tới hành động khác thì hành động đó chia QKHT

`**` Trong câu gián tiếp, nếu ngữ cảnh chia quá khứ đơn thì lùi xuống thì QKHT

`1,` had worried - heard

`2,` was - had thought

`3,` had shot

`4,` drank - had finished

`5,` had folded - opened - entered

`6,` had brought

`7,` had worked - decided

`8,` arrive - had already gone 

`9,` had waited - finished

`10,` had left - finished

`11,` had bought - went

`12,` had just turned off - rang

_______________________________

`@` QKĐ

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

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

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

`->` Hành động đã xảy ra ở quá khứ

`@` QKHT

`(+)` S + had + P2 ...

`(-)` S + hadn't + P2 ...

`(?)` Had + S + P2 ... ?

`->` Hành động đã xảy ra và hoàn thành trước hành động khác trong quá khứ

`**` Before QKĐ, QKHT

`**` By the time QKĐ, QKHT

`**` After QKHT, QKĐ

`**` Hành động xảy ra trước `->` QKHT

`**` Hành động xảy ra sau `->` QKĐ