It’s a good idea to brush your teeth after meals., You should/ought to brush your teeth after meals, It is necessary to switch off your mobile phone during exams., You have to switch off your mobile phones during exams, It isn’t necessary for us to get up early at the weekends., We don’t have to get up early at the weekends., Doctors are obliged to wear a uniform at work., Doctors have to wear a uniform at work., It’s not a good idea to eat in class, You shouldn’t/ought not to eat in class, It is a teacher's duty to check students’ homework., A teacher has to check students’ homework., It’s not necessary for Tom to go to football practice on Sundays., Tom doesn’t have to go to football practice on Sundays., It’s not a good idea for students to be late for the exam., Students shouldn’t/ought not to be late for the exam., It’s not necessary for Jane to take the bus to school., Jane doesn’t have to take the bus to school, It’s a good idea to exercise to keep fit., You should/ought to exercise to keep fit, It’s Ruth’s duty to answer phone calls and make appointments., Ruth has to answer phone calls and make appointments, It isn’t necessary for students to wear a uniform at school., Students don’t have to wear a uniform at school..

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