When do we use can?, to express ability or lack of ability, to make a polite request(very formal), to make a polite request, Which examples are correct?, I can ride a bike., I may not ride a bike., Andrei, can I borrow your pen?, I can't sing very well., When do we use may?, to make a polite request, to make a polite request(very formal), Choose the right example., May I come in, sir?, Can I come in, sir?, When do we use must?, prohibition, ability, obligation, necessity, What's correct?, You must set the table. (prohibition), You must set the table.( obligation), You mustn't walk on the grass.( prohibition), You mustn' walk on the grass.( necessity)

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