이었다면

if ... was, if ... had been

→ 이다

이 to be + 었 Past tense + 다면 If; conditional

auxiliary · past tense Rare #21,452

if ... was, if ... had been Used after a noun to form a past conditional; often translated with “had been” in hypothetical situations.

KO: 그게 사실이었다면 나도 믿었을 거야.

EN: If that had been true, I would have believed it too.

Conjugation of 이다

If even one of them had been true.

— 클리너 (2025)