1. You will have to work much harder at home if you miss the lesson.
2.By 8 o'clock yesterday I was doing my homework and was ready to help you.
3.When I opened the door of the classroom, I saw that the teacher already came and the pupils wrote a dictation.
4. When I looked out of the window, the children were playing football in the yard.
5. He entered the room, took something from the desk and went.