He works hard on math now. → He didn't use to work hard on math

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0. He works hard on math now. → He didn't use to work hard on math.
1. He gets up early and does morning exercise.
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2. He helps his sister with washing the dishes.
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3. He doesn't stay out late at night.
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4. He doesn't cheat in exams.
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5. He isn't selfish or careless anymore.
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6. He is quick at understanding science.
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7. He doesn't stay up late reading comics.
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8. There isn't anything wrong in his behavior.