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을 내야

… have to pay

→ 을
phrase Common #2,313
… have to pay This is a sentence fragment: 을 marks the thing being paid for, and 내야 expresses that payment is required.
KO: 돈을 내야 입장할 수 있어요.
EN: You have to pay to get in.

시작하면 끝을 내야 돼요

Once you start something, you have to finish it.

— 엑소시스트: 믿는 자 (2023)

왜 조각을 내야 하는데요?

Why do we need to break it into pieces?

— 더스트 버니 (2025)

보험금을 내야 합니다

You have to pay the insurance premium.

— 이중 배상 (1944)

처음부터 끝을 내야 돼

You have to see it through to the end from the very beginning.

— 대부 (1972)