No, you must show your membership card whenever you sign in. (= you are obliged to) - No, you are obliged to show your membership card whenever you sign in. , We must go now or we'll be late. - We're obliged to go now or we'll be late., You must be back at noon. - Make sure you'll be back at noon.(-order), You mustn't wear shorts at work. - It's forbidden for you to wear shorts at work. ( - prohibition), You mustn't ... - It's against the rules to ..., You must... - It's your duty to ..., Staff must wash their hands before entering the kitchen. - It's the rule for the staff to wash their hands before entering the kitchen., You mustn't eat in the library. - It's forbidden to eat in the library. (prohibition) - , You must wash the dishes after dinner. - You are obliged to wash the dishes after dinner., You mustn't eat in the gym. - It's forbidden to eat in the gym., You mustn't bring your own food to the festival. - It's forbidden to bring your own food to the festival., You must see a dentist. - I strongly advise you to see a dentist.,

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