-기에 (망정이지)

A-기에 망정이지 B means 'luckily A happened; otherwise the bad outcome B would have happened.'

이유·원인Reason & cause

Han: The clause after 망정이지 must describe the bad outcome that was avoided (e.g. -(으)ㄹ 뻔했다), not the actual result.

Examples

미리 예약했기에 망정이지 자리가 없어서 못 들어갈 뻔했어요.Good thing we booked ahead; there were no seats and we almost couldn't get in.

친구가 깨워 줬기에 망정이지 그렇지 않았으면 시험에 늦었을 거예요.Luckily my friend woke me up; otherwise I would have been late for the exam.

우산을 가져왔기에 망정이지 하마터면 비를 다 맞을 뻔했어요.Good thing I brought an umbrella, or I would have gotten completely soaked.

안전벨트를 맸기에 망정이지 크게 다칠 뻔했어요.It's a good thing I had my seat belt on; I could have been badly hurt.

-기에 (망정이지)vs-아서/어서 다행이다It simply expresses relief and needs no 'otherwise' clause; -기에 망정이지 always points to the bad result avoided: 우산을 가져와서 다행이에요.

-기에 (망정이지)vs-기에 (reason)Plain -기에 just gives a neutral reason in written or formal style, with no sense of luck: 날씨가 좋기에 산책을 나갔다.

V/A+(았/었)기에 망정이지

N+이었기에/였기에 망정이지 (+ -(으)ㄹ 뻔했다 / -았/었을 거예요)

미리 예약하다 → 미리 예약했기에 망정이지

The second clause describes the bad result that did NOT happen, usually with -(으)ㄹ 뻔했다 or -았/었을 거예요; it does not state the actual outcome.
The first clause is a real, usually past, lucky fact, so action verbs normally take 았/었 (왔기에, 했기에).
It cannot be followed by a command, suggestion or future plan.
In everyday speech -(으)니까 망정이지 and -아서/어서 망정이지 are used with the same meaning.

Wrong: ~~우산을 가져왔기에 망정이지 비를 안 맞았어요.~~

Right: 우산을 가져왔기에 망정이지 비를 다 맞을 뻔했어요.

The clause after 망정이지 must describe the bad outcome that was avoided (e.g. -(으)ㄹ 뻔했다), not the actual result.

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