でなくてなんだろう - Grammar Discussion

if … is not … then what is?

Structure

  • Noun + でなくてなん + だろう/であろう + (か)

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I think it would be helpful if you mentioned that using other ways of negating the expression (e.g. じゃなくて・ではなくて) may look like they’d have the same meaning but apparently lack the nuance of a rhetorical question, so it sounds like you are asking an actual question.

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