He's a brilliant student. He ... work hard to get good marks.
doesn't have to
In football, you ... touch the ball with your hand.
musn't
When you're driving, you .... use the cellphone.
musn't
You ... talk in the cinema
musn't
Make a rule with "stay at home in quarantine"
You must stay at home in quarantine.
You ... eat that bread. It's a week old.
musn't
Make a rule with "eat in bed"
You musn't eat in bed.
You ... feed the dog. I've already done it!
don't have to
You ... take your shoes off if they are clean.
needn't
You ... listen to the teacher's instructions.
must
You ... pay the rent today! don't forget
must
Smoking in the museum it's forbidden! You ... smoke outside.
must
You ... go to the check-in desk if you have checked-in online.
needn't
You musn't tell anyone about the party. It's a surprise.
musn't
I've already phoned Jane. You .... do it again.
needn't
You ... throw rubbish here!
musn't