1. Minh looks very tired. (go to bed late)

He ought not to go to bed late

2. My parents are going to visit France. (learn a few French words)

My parents ought to learn a few French words 

3. It’s eight o’clock. Helen is still sleeping. (get up earlier)

She ought to get up earlier

4. There is traffic jam and the people are rushing forward. (drive like that)

They ought not to drive like that

5. Nam is going to have final exam tomorrow morning. He is playing computer games now. (play

computer games – learn the lessons)
He ought not to play computer games,he ought to learn the lessons​

6. The speed limit is 30 mph, but Catherine is driving 50 mph. (drive so fast)

She ought not to drive so fast

7. The street is too narrow. It’s always full of vehicles. (they/ widen this street)

They ought to widen this street

8. I’m bored. I need a change. (go away for a few days)
You ought to go away for a few days