`1.` Tom ___________ (work) on the project all day before he realized he ___________ (make) a mistake. `2.` I ___________ (catch up) with a good book when I realised that the rain ___________ (pour) down all afternoon. `3.` When we were young, my brother ___________ (always / borrow) my toys.

Đáp án :

1 . had been working/realized 

`-` S + had been + V_ing

`-` Before + S + V_ed + O

2 . was catching/had been pouring

`-` S + was / were + V_ing , S + V_ed + O .

3 . was Always borrowed .

`-` S + was + V_ed + O .

`-` When + S + V_ed + O .

`-----`

Chúc bạn học tốt !

`Sen`

`1` had worked `-` had made .

`-` Hành động đã xảy ra trước một hành động trong quá khứ .

`=>` Quá khứ hoàn thành : S + had + V3/V_ed + O ...

`-` S + had + V3/V_ed + O + before + S + V(quá khứ) + O ...

`2` was catching up `-` had been pouring .

`-` S + was/were + V_ing + when + S + V(quá khứ) + O ... : Ai đó đang làm gì thì ai đó làm gì ...

`-` Hành động đã xảy ra trước một hành động trong quá khứ , lặp lại .

`=>` Quá khứ hoàn thành tiếp diễn : S + had + been + V_ing + O ...

`3` was always borrowed .

`-` Hành động thường diễn ra trong quá khứ , gây phiền toái :

`@` S + was/were + always + V_ing + O ...

`@` Đây không phải thì quá khứ tiếp diễn `!`