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じゃないでしょ

isn't ..., right?

→ だ
phrase Rare #30,970
isn't ..., right? Often seeks agreement or points out something the speaker expects to be obvious; it can sound admonishing depending on tone.
JA: ここは遊ぶ場所じゃないでしょ。
EN: This isn't a place to play, right?

あなたの仕事じゃないでしょ。

That's none of your business.

子供じゃないでしょ

You're not a child, are you?

— 動くな、死ね、甦れ！ (1990)

もう赤ちゃんじゃないでしょ。

You're not a baby anymore, are you?

トムはもうそれをする年じゃないでしょ。

Tom's not old enough to do that anymore, is he?

トム、電車は踊るところじゃないでしょ！

Tom, the train isn't the place to dance!