You mustn't drink soda., You must switch off your MP3 player., You can take pictures., You can use your mobile phone., You mustn't fight., You mustn't cheat., You can run in the yard., You mustn't run in the corridors., You must be polite with everyone., You mustn't eat sweets., You must be quiet.,

English Modals : CAN, MUST or MUSTN'T ?

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