This question already has an answer here:

  1. what are they doing?
  2. What they are doing?

What is the difference between these two? Both are correct?

marked as duplicate by Walter, Jonathan Garber, StoneyB, Persian Cat, Hellion Aug 7 '13 at 20:45

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  1. correct syntax for a stand alone question. What are they doing?

  2. incorrect or incomplete - I know what they are doing would be correct

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