Can you guess who this is? -- I'd say a question. No one can command you to make the guess.
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Grammar GeekCan you guess who this is? -- I'd say a question.Right, but what about "Guess who this is" (which is what I think the OP meant)? I'd say grammatically that must be an imperative, even though it's usually intended more as a question/invitation. No?
PhilipGuess who = statementDo you not think that, grammatically, "guess" has to be an imperative, and therefore the statement has to grammatically be a command?