Anonymous As far as I know, when they are used for the meaning of 'allowed', there is no nuance. As far as I'm concerned, the only nuance is in the head of the 'stickler for propriety' like the school teacher you mentioned. I think most Americans now accept 'can' in place of 'may' for permission, Even a clerk in a store might use either: May/Can I help you?
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Anonymous As far as I know, when they are used for the meaning of 'allowed', there is no nuance.As far as I'm concerned, the only nuance is in the head of the 'stickler for propriety' like the school teacher you mentioned. I think most Americans now accept 'can' in place of 'may' for permission, Even a clerk in a store might use either: May/Can I help you?