People are often unclear whether there is any difference between may and can when used to request or express permission, as in may/can I ask you a few questions? It is still widely held that using can for permission is somehow incorrect, and that it should be reserved for expressions to do with capability, as in can you swim? Although using can to request or give permission is not regarded as incorrect in standard English, there is clear difference in formality between the two verbs: may is a more polite way of asking for something and is the better choice in more formal contexts.
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