Difference between What are they doing? vs What they are doing?

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

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

Answer

  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

Attribution
Source : Link , Question Author : T2E , Answer Author : mplungjan

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