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Which one is correct? Leaning towards first one but I am unsure because a more basic version would be "How good is it?"

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1 Answer 1

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Think of it like this. Work backward from the answer:

               You think it is  X  good.  ... replace X with interrogative 'how'
               You think it is how good.  ... invert the subject with auxiliary 'do'  
            Do you think it is how good?  ... move the interrogative phrase to the front
   How good do you think it is?

"How good is it?" works backward from a different answer:

                         It is  X  good.  ... replace X with 'how'. 
                         It is how good.  ... invert with auxiliary.
                         Is it how good?  ... move the interrogative to the front.
                How good is it?

But your question isn't about how good it is, it's about what the other person thinks.

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  • Thank you for bringing up this approach. Just what I was looking for, very helpful.
    – L.White
    Commented Mar 15, 2016 at 1:13
  • Is there a name to this procedure and is it a tool to check syntax?
    – user54542
    Commented Jul 15, 2017 at 18:19
  • 1
    It's sorta "Transformational Grammar (TFG) 101", with a lot of the theoretical underpinnings skimmed over. Commented Jul 15, 2017 at 20:35

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