Which sentence is grammatically correct?

  1. I don't know why did I write it
  2. I don't know why I did write it

Thanks for any answers

  • 3
    Neither: "I don't know why I wrote it." You can use did in a slightly different sentence: "Why did I write it?" – Weather Vane Feb 19 '20 at 16:03
  • ...although as an answer implies, the second can be used in emphasis when replying to a question, but without that context I gave the straight-forward version. – Weather Vane Feb 19 '20 at 16:21

the first one is incorrect, but the latter is true, but WHY?
one of the usages of "do", as an auxiliary verb, is to emphasize what we are saying, for example:

He does look tired. (He looks tired)
He did at least write to say thank to you. (He at least wrote to say thank to you)


This is called embedded question.


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