Câu trong ảnh làm như nào các bạn ơi...

Dũng Trương

1. I haven’t seen Mary since she left school.

2. While we were having dinner, the lights suddenly went out.

3. He usually goes to school by bus, but today he is walking.

4. By this time next year, I will have been studying in the UK for 6 months.

5. She has been writing emails all morning, and she still has not finished.

6. When I arrived, they had already started the meeting.

7. He used to play the piano when he was young.

8. What were you doing at 9 p.m. last night?

9.By the end of this week, we will have completed our group project.