You must wear a seatbelt when you drive a car., She doesn't have to wear a uniform at school., You needn't worry about the meeting – it's cancelled., The government ought to invest more in renewable energy., You shouldn't interrupt people when they're speaking., She 'd better study more if she wants to pass the exam., Passengers are not allowed to speak to the pilot., All citizens are obliged to pay their taxes., Employees are required to complete the safety training., It is advisable to book tickets in advance., It is essential to switch off your phone before a take-off., It's up to you whether you accept the job or not., You are free to choose any project you like.

modal structures

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