`1.` had left

`2.` had lived

`3.` had never been

`4.` had finished

`5.` hadn't finished

`----------->`

`@` Cấu trúc thì Quá khứ hoàn thành

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

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

`( ? )` Had + S + V3/-ed + O?

`-` Dấu hiệu nhận biết: before, after, by the time,...

Thì quá khứ hoàn thành: 
Cấu trúc: KD: S + had + V( pp )+ O 

               PD: S + hadn't + V( PP ) + O 

               NV: Had + S + V ( pp ) + O 

Bài làm 

1, Had Left

2, Had lived 

3, Had never been 

4, Had finished

5, Hadn't finished