EXPRESS OBLIGATION: I have to do hand in my homework in time, People must wear a helmet when they cycle, You must have your passport to go through customs, I must wear my blazer, NOT NECESSARY TO DO SOMETHING: I didn't have to be there early, I do not have to see the teacher after school, EXPRESS PROHIBITION/ SOMETHING IS NOT ALLOWED: You mustn't talk during an exam, You can't leave early, You are not allowed to take the train on your own, EXPRESS PERMISSION/ LACK OF PERMISSION: You can take off your blazer if you have asked the teacher, You can 't sit here because there are books, Can I go to the bathroom, please?, GIVING OR ASKING FOR ADVICE: I don't know what I should do, What should I do?, You should practice sports at least 3 times a week,

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