It is necessary / a legal obligation: You have to wear a seat belt when you are driving., We need to complete our tax form before 5th April., All passengers must fasten the seatbelts before take-off., It's not necessary: We don't have to work at weekends in our company., The report doesn't have to be finished today., I don't need to go to the office today., It's possible / permitted by law: You can leave early today because we're not very busy., Companies are allowed to advertise alcohol after 10 pm., It's not permitted: Sorry, but you can't smoke here., Cyclist aren't allowed to use motorways., Visitors must not park in the staff car park.,
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