1. The lesson hasn't started yet.

2. The teacher has already written on the borad.

3. Joe and Tim have just come into the classroom.

4. Tony hasn't finished getting his books already.

5. Christine has already opened her book.

6. Crave has dropped his pen on the floor.

7. He hasn't pickes up yet.

1 the lesson has not started yet
2 the teacher has already written on the board
3 Joe and Tim have just come into the classroom
4 Tony has not finished getting books ready
6 Dave has dropped the pen on the floor
5 Christine has already opened the book
7 he has not picked it up yet