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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