You can't be late.
I'm hungry. I need to eat something.
Go out. You mustn't stay here.
Your exam is next week. You should start revising.
Try to relax before the exam. You shouldn't panic.
This is not your mobile. You mustn't use it.
It's very late. We must go home.
You don't have to go to school on Saturday.
It's a new word to me. I must check it in my dictionary.
We are late. We must hurry up