Used to express elapsed time since something happened. Combines the past/completed modifier -(으)ㄴ with the bound noun 지 (time period). Often followed by time expressions and verbs like 되다 (become), 지나다 (pass), or 넘다 (exceed).

• •Time passed: "한국에 온 지 2년이 됐어요" (It's been 2 years since I came to Korea)
• •With 지나다: "밥을 먹은 지 3시간이 지났어요" (3 hours have passed since eating)
• •With 되다: "담배 끊은 지 한 달 됐어요" (It's been a month since I quit smoking)