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You must not talk in the class.
obligation
You souldn't talk in class.
advice
You may discuss this with your classmates now.
permission
You should write in ink - it's clearer.
advice
You must write in black ink.
obligation
You may use a dictionary.
permission
You should dress smartly for school.
advice
You mustn't wear jewellery in school.
obligation
You have to greet your teacher every morning.
obligation
