Obligation (+), You must arrive on time for the lesson., You have to pay your taxes, You must take your passport when you travel abroad., All drivers must be 17 or over., Prohibition (-), You mustn't ride your bicycle on the pavement., You're not allowed to smoke in the cinema., You mustn't use your mobile phone while driving., Riding a bicycle on the motorway is forbidden., Choice, You can stay in the park all day., We don't have to work on Saturdays., You don't have to get married in a church..

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