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됐겠지

must have become, must be ... by now

→ 되다
됐 Past tense + 겠 conjectural or potential ending + 지 Clause-ending marker for assertion or confirmation
verb · informal, past tense Rare #21,041
must have become, must be ... by now Expresses a guess or expectation about a resulting state.
KO: 이제 준비가 됐겠지.
EN: It must be ready by now.
Conjugation of 되다
Potential past
됐겠지됐을까

군인이 됐으면 걔들도 군인 됐겠지

If he became a soldier, they probably became soldiers too.

— 아메리칸 갱스터 (2007)