Write negative sentences. Use short forms

Write negative sentences. Use short forms.
1. I'm the best in the class. => .....................................................................
2. Mark does homework in the evening. => ...............................................................
3. We play football after school. => .......................................................................
4. You run fast. => .....................................................................
5. Tim and Lucas work at weekends. => .................................................................
6. I like classical music. => ...................................................................
7. These exercise are difficult. => .....................................................................
8. She has science on Fridays.=> .......................................................................