If そうなんですか (sounandesuka) is formal, how come it's not often that I hear of そうなんだか (sounandaka) as casual version or maybe that I just don't hear enough? thanks.


Because speaking casually very often means discarding the question mark か as well, making the casual version of そうなんですか? -> そうなんだ? It's just not そうなんだか, but "だか" that you wouldn't hear in any sentence, because you would simply stop at だ。

  • 1
    It's pretty frequent that そうなんですか・そうなのか aren't really questions at all
    – Angelos
    Jul 4 '20 at 17:39

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