1. Her room is very dirty. (clean it every day)

⇒ She ought to clean it every day

2. I play tennis badly. (practice tennis more regularly)

⇒ You ought to practice tennis more regularly

3. My father has a sore throat. (not smoke so much)

⇒ He ought not to smoke so much

4. Nam feels very tired. (go to bed early)

⇒ Nam ought to go to bed early

5. He had an accident last week. (not drive so fast)

⇒ He ought not to drive so fast

6. I catch flu. (stay in bed)  

⇒ You ought to stay in bed

7. Hoa feels sleepy. (not stay up late)

⇒ Hoa ought not to stay up late