I don't know
"No lo sé, la madre nunca me lo dijo".
“I don't know; Mum never told me.”
— Durante la tormenta (2018)
"Nada","No lo sé", es todo lo que dices estos días.
“Nothing,” “I don’t know”—that’s all you’ve been saying these days.
— Masaan 2015 (2015)