9. He was very sad because he _________________ (fail) the final examination twice. 10. I _________________ (go) home when it ______________ (begin) to rain 11. When I came home, my mother _________________ (cook) meals, so I enjoyed it.

9. He was very sad because he $\text{failed}$ the final examination twice

=> $\text{Anh ta rất buốn vì anh ấy đã trượt bài kiểm tra}$

10. I $\text{was going}$ home when it $\text{began}$ to rain

=> $\text{S + }$ $\text{was/were + V-ing}$ $\text{when}$ $\text{S + V-ed}$

=> $\text{Sự việc đang diễn ra. có 1 sự việc bất ngờ chen vào}$

11. When I came home, my mother $\text{was cooking}$ meals, so I enjoyed it.

=> $\text{Khi tôi về nhà, mẹ tôi đang nấu ăn}$

9. failed.

- Hành động xảy ra trong quá khứ.

=> Quá khứ đơn : S + V(quá khứ) + O.

10. was going - began .

- Quá khứ tiếp diễn : S + was/were + V_ing + O.

- Quá khứ đơn : S + V(quá khứ) + O.

11. had cooked.

- Quá khứ hoàn thành : S + had + V3/Vpp + O.