Obligatory/Necessary: We have to wear a uniform when we're working in reception., Seat belts must be worn by all passengers., Al has to work tomorrow so he can't come., Not allowed/prohibited: You mustn't be late to class., ou can't take photos in the museum. They're really strict about it., Guests must not make noise after 10 p.m., Allowed/ optional: You don't have to wear a tie in our office but some people like to dress more formally., You don't have to go to the bank to do a transfer. You can do it online., You don't have to come with me, honestly. I'll be fine!,

2a Modals - permission and obligation

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