Possibility: Eating fruits can make you feel better., We can't eat a lot of fast food and expect to feel great., Obligation: You must eat fruits and vegetables to stay healthy. , I have to drink some coffee in the morning. , No obligation: You don't have to stop eating to lose weight. , She doesn't have to take vitamins because she eats well. , Prohibition: You mustn't play games during class. , He mustn't exercise too much. His knee is hurt.,

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