Find the mistakes:
1. I’m busyier than my little sister. . ……………………………
2. London is more old than New York. . ……………………………
3. This exercise is difficulter than that one. . ……………………………
4. Be activier at your lesson, please. . ……………………………
5. The boy is more taller than his father. . ……………………………
6. He makes more mistakes that you do. . ……………………………
7. Yesterday he started to feel more bad. . ……………………………