1. Jim's suitcase isn't heavy Tom's suitcase is heavier
2. Janet isn't very popular. Her sister is more popular
3. The cat isn't hungry. The dog is hungrier
4. Her flat isn't big .Mine is bigger
5. This exercise isn't difficult. The previous one was more dfficult
6. You aren't very healthy .Your sister is healthier
7. His job isn't boring My job is more boring
8. Your city isn't crowded. Their city is more crowded
9. I haven't got a fast car, I want a faster one.
10. This tablecloth isn't clean. That one is cleaner