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〜んだから・〜のだから

since, because (as you well know)

Plain form + んだから (な-adj, Noun + な)

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んだから gives a reason that the listener already knows or should accept, often to justify advice or a demand: もう大人なんだから、自分で決めなさい, "you're an adult now, so decide for yourself".

It's から with the explanatory ん (N5). That ん makes the reason feel obvious, which adds pressure: "given that, surely you see".

It's common in advice, persuasion and mild scolding. It can also be warm: せっかく来たんだから、ゆっくりしていって, "you've come all this way, so stay and relax".

Nouns and な-adjectives take な: 子どもなんだから. The formal version is のだから.

Examples

  • もう大人おとななんだから、自分じぶんで決きめなさい。

    You're an adult now, so decide for yourself.

  • 疲つかれているんだから、早はやく寝ねたほうがいい。

    You're tired, so you'd better get to bed early.

  • せっかく来きたんだから、ゆっくりしていって。

    You've come all this way, so stay and relax.

  • 約束やくそくしたんだから、守まもらなきゃ。

    You promised, so you have to keep your word.

  • 子こどもなんだから、仕方しかたないよ。

    They're only a child, so it can't be helped.

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