Three things you mustn't do in a restaurant, Three things you have to do if you want to improve your English, Three things you mustn't do in a park, Three places you can't go into without paying, Three things you can't do in a library, Three things you had to do last week, Three things you have to take with you if you go abroad, Three things you mustn't do when driving a car, Three things you mustn't do in a cinema, Three things you don't have to do when you are on holiday, Three things you have to do every day.

Have to/must/can

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