N2 — outside your level filter
Is said whole, with nothing composed onto it and takes no だ/です, so there are no forms to conjugate.
なるほど
naruhodoI see, indeedN2expression
Example sentences2
なるほど、そういうことだったんですね。
naruhodo, sou iu koto datta n desu ne.
I see, so that's how it was. neutral
なるほどね、分かった。
naruhodo ne, wakatta.
I see, got it. casual