thì QKHT ta có cấu trúc 

S + had + VPII 

thì QKHT diễn tả hành động đã xảy ra và được hoàn tất trước 1 thời điểm trong quá khứ

1 went - had gone 

2 went - had found - had lost 

3 got - told - had cooked

4 returned - had   bult

5 arrived - had  started

6 said - had done - went

7 began - had reviewed

8 made - had read

3.went...had gone                                 4.went....had found....had lost                                      5.got....told....had cooked

6.returned....had already built               7.arrived....had already started                  8.said....had done...went

9.began...had reviewed                               10.made....had read

->  before/by the time+S1+Ved/c2,S2+had+Ved/c3

->after+S1+had +Ved/c3,S2+Ved/c2