It isn't necessary for us to get up early. (NEEDN'T)
We needn't get up early.
You ________ do the dishes. I will do it later.
don't need to / needn't / don't have to
It's not obligatory for them to go to school on Saturdays. (HAVE TO)
They don't have to go to school on Saturdays.
At the cinema, you have the obligation to stay in silence, so everybody can pay attention to the film. (MUST)
At the cinema, you must stay in silence, so everybody can pay attention to the film.
Taking your passport with you when you travel abroad is indispensable. (MUST)
You must take your passport with you when you travel abroad.
I can lend you some money, so it isn't necessary for you to go to the bank. (NEED TO)
I can lend you some money, so you don't need to go to the bank.
It's fundamental that you pass the test tomorrow if you want to get your driver's license. (HAVE TO)
You have to pass the test tomorrow if you want to get your driver's license.
They make us wear a school uniform. (HAVE TO)
We have to wear a school uniform.
I don't recommend you to talk to him right now. He's very stressed. (SHOULD)
You shouldn't talk to him right now. He's very stressed.
If you're tired, I advise you to go to bed. (OUGHT TO)
If you're tired, you ought to go to bed.
It isn't necessary for her to do this assignment this week, she can do it next week. (NEEDN'T)
She needn't do this assignment this week, she can do it next week.
It would be a good idea to eat healthier food. (SHOULD)
You should eat healthier food.
You ________ smoke on planes.
mustn't
Students are prohibited to use their mobile phones during class. (MUST)
Students mustn't use their mobile phones during class.