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誰にも話さない

not tell anyone

→ 誰
phrase Rare #20,627
not tell anyone 誰にも話さない can mean “I won’t tell anyone” or “don’t tell anyone,” depending on the sentence. With で, 誰にも話さないで means “don’t tell anyone,” while 誰にも話すな is a stronger, rougher command with the same meaning.
JA: このことは誰にも話さないでね。
EN: Don't tell anyone about this, okay?

君が何をしたか僕は誰にも話さないだろう。

I won't tell anyone what you did.

誰にも話さないって約束する？

Will you promise not to tell anyone?

誰にも話さないよ。

I won't tell anyone.

誰にも話さない

I won't tell anyone.

— コーラス (2004)