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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