Change the present simple sentences to negative by adding do/does + not. Don't forget capital letters at the start and full stops at the end.
1. They read their books. 
2. The girl reads her book. 
3. He runs very fast. 
4. I swim very well. 
5. We sleep at night. 
6. He speaks Chinese very well. 
7. My mother gives me money. 
8. They speak English every day. 
9. I run in the park. 
10. She swims in the sea.