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CAN	CAN'T	MUST	MUSTN'T
ability, request or possibility/permission "I can jump high!" (ability) "Can I go to the toilet, please?"(request) "You can eat in the canteen" (possibility/permission)	lack of ability, certainty that something is impossible, lack of permission. "She can't speak Japanese" (lack of ability) "He can't be home so early" (certainty that something is impossible) "You can't go to the toilet now" (lack of permission)	necessity, obligation, certainty that something is true. "You must study if you want to pass the exams" (necessity) "You must follow the rules" (obligation) "It's ten o'clock, so James must be home." (certainty that something is true)	prohibition "You mustn't exceed the speed limit"

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