EX8: 1. My brothers often sleep on the floor.
2. Does he sometimes stay up late?
3. I always do the housework with my brother.
4. Peter and Mary never come to class on time.
5. Why Johnson always good mark?
EX9: 1. She doesn't sleep late on the weekends.
2. We don't believe ghost.
3.Do you understand the question?
4.They don't work late on Friday.
5.Does David want some coffee?
