Нужно сделать это в past continuous, заранее !! i/read/a book
who/you/sit next to?
I/sit/next to Mark and Tony
they/read?
no/they/do an exercise
what/your teacher/do?
he/stand near the window
he/look out of the window?
no/he/not look out of the window

1. I was reading a book.

2. Who was sitting next to you?

3. I was sitting next to Mark and Tony.

4. Were they reading?

5.No, they were doing an exercise.

6.What was your teacher doing?

7. He was standing near the window.

8.Was he looking out of the window?

9.No, he was not looking out of the window.