이었을까

was ...?

→ 이다
이 to be + 었 Past tense + 을까 Conjectural question
auxiliary Rare #23,352
was ...? Used to wonder or ask whether something was the case.
KO: 그건 우연이었을까?
EN: Was that a coincidence?
Conjugation of 이다

저 둘도 정말 사람 이었을까?

Were those two really human, too?

그게 맞는 말 이었을까?

Was that the right thing to say?

마티나의 억양 때문 이었을까?

Was it because of Martina’s accent?

그 훨씬 전의 물이나 공기에도 유전자는 있는 것 이었을까?

Could it be that even water and air from long ago had genes?

— 아키라 (1988)

그것은 무엇 이었을까?

What could it have been?

— 잠입자 (1979)