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수는 없었다

couldn't

→ 수
phrase Rare #22,517
couldn't Used after a verb to say that something was not possible or could not be done. The particle 는 adds emphasis or contrast.
KO: 너를 그냥 두고 갈 수는 없었다.
EN: I couldn't just leave you behind.

유산에서 돈을 더 빨리 꺼낼 수는 없었다.

There was no way to get the money out of the estate any sooner.