1. Don't be careless.
2. Don't be more careless than you are.
3. Take this armchair. It's more comfortable.
4. Read this book. It's more interesting.
5. He is the laziest of my sons.
6. She is as weak as her husband.
7. He is not an interesting person, he is the most interesting person.
8. This problem is the hardest.
9. They can't be nicer than our friends.
10. We have two rooms. I sleep in the smaller one.