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그걸 어떻게 알아요

How do you know that?

→ 그것+을
phrase Uncommon #12,656
How do you know that? 그걸 means “that” as the object. 도대체, when added at the beginning, emphasizes the question, like “on earth.”
KO: 그걸 어떻게 알아요?
EN: How do you know that?

허, 내가 그걸 어떻게 알아요?

How am I supposed to know that?

— Unlocked (2023)

네, 그걸 어떻게 알아요?

Yes, how do you know that?

— 세 얼간이 (2009)

그걸 어떻게 알아요, 엄마

How do you know that, Mom?

— 천공의 성 라퓨타 (1986)

그걸 어떻게 알아요?

How do you know that?

— 엘 시크레토: 비밀의 눈동자 (2009)