ability: present - My father CAN PLAY the violin., ability: past - My mother COULDN'T DRIVE until she was 40., asking for permission - CAN I MAKE a suggestion?, asking for permission: more polite - COULD I USE this phone for a moment?, giving permission - You CAN HAVE a break now., no permission - You CAN'T PARK here., requesting - CAN YOU GIVE this letter to Reza?, requesting: more polite - COULD YOU PASS me the salt, please?, offering - I CAN DO the shopping if you like., offering: more polite - COULD I MAKE you a cup of tea?,

YM-'can' and 'could'

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