🔴 FORBIDDEN (mustn't), Use your phone during an exam, Run in the hospital corridor, Eat a lot of junk food, 🟡 NECESSARY (have to / must), Wear a seatbelt in a car, Get nine hours' sleep (teenagers), Eat vegetables every day, Drink water regularly, ⚪ OPTIONAL (don't have to), Have a pet to be happy, Play a musical instrument

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