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I have been corrected for using "Please, can you tell me exactly what happened?" instead of saying "Please, tell me exactly what happened?" I was told that using can you changes the meaning of the question. I cannot find anything that supports their claim. Can you provide me with the proper usage and why?

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    A smart aleck, a pedant, or a non-native speaker might answer with "Yes" instead of the information you want. But what you wrote is fine. – jejorda2 Sep 28 '16 at 17:12
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    Can you tell me is more polite than tell me. And could you tell me is more polite than can you tell me. – michael.hor257k Sep 28 '16 at 18:20
  • Technically, "Please tell me exactly what happened" is an imperative, not a question, so it should not have a question mark at the end. – stangdon Sep 28 '16 at 21:26
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A person who is being needlessly, boorishly pedantic could take the absolute most literal meaning of "can you" as "are you capable of" and reply simply, "Yes." This person is essentially saying, "I did witness the events and I am able to communicate using human speech."

However, social convention provides a more loose interpretation of "can you" as "are you capable of, and if so, please do."

A similar situation arises in the common scenario of two strangers crossing paths on the street and one asking the other, "Excuse me, can you tell me the time?" This allows the response of "I'm sorry, no," without necessarily having to add, "because I do not have a watch or do not know how to tell time." Of course, this convention also allows for the answer, "Sure, it is 3:15," without having to preface it with anything.

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    Grammars do not rank the usages of the modals along a 'literalness' continuum. The hedging usage is every bit as valid as the epistemic usage. Though perhaps hedging 'Can you ...' is more informal than 'Could you ...'. – Edwin Ashworth Sep 28 '16 at 18:07

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