Is there any connotation difference between these two questions :

"Do you know why did he make that decision ?"

and :

"Do you know why he made that decision ?"



"Do you know why he made that decision?" is a correctly built question.

"Why he made that decision" is the object of the sentence (do you know (what?) why he made that decision?)

It's not right to try to build 2 questions within 1 sentence.

Making the object of the sentence, use the affirmative sentence word order:

Do you know why he did that?

Do you understand why I am doing this?

Do you realize how hard I have been trying?

  • So the first question is not grammatically incorrect, is it ?
    – Norbert
    May 13 '19 at 12:06
  • 1
    @Enguroo Yes it is! (Grammatically incorrect.) The first sentence is not grammatical. Either did or do you know has to be removed. May 13 '19 at 18:16
  • 1
    @Norbert the first sentence is grammatically incorrect.
    – Enguroo
    May 13 '19 at 22:54

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