absolute external law or regulation - You must wear a seatbelt in the car, a regulation or necessity to reach a goal or to do something - We have to switch our smartphones off during the lesson, something is forbidden - you mustn't take photo in the museum, something is not permitted - you can't go out tonight, giving an advice (it's a bad idea) - you shouldn't eat so much junk food, giving an advice (it's a good idea) - you should use your bike more, suggesting possibilities - We could have a party for your birthday, ability - He can sing well, past ability - I could understand everything she said, to ask and give formal permission - May I switch on the TV?, to ask and give permission - Can I ask you something?, to ask and give permission, it is very polite and formal - I wonder if I might have a little more cheese?,

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