-(으)ㄴ/는 터라

-(으)ㄴ/는 터라 presents an already existing situation as the background reason for what follows, mostly in formal or written Korean.

이유·원인Reason & cause

Han: -(으)ㄴ/는 터라 cannot be followed by a command; to give advice based on a reason, use -(으)니까.

Examples

그는 그 분야에서 오래 일한 터라 이번 문제도 금방 해결했다.Having worked in that field for a long time, he solved this problem quickly too.

요즘 회사 일이 많은 터라 주말에도 쉴 틈이 없다.Since there is a lot of work at the company these days, I have no time to rest even on weekends.

마침 저도 나가려던 터라 같이 가기로 했어요.I was just about to go out anyway, so we decided to go together.

어젯밤에 잠을 거의 못 잔 터라 회의 내내 집중이 잘 안 됐다.Since I had barely slept last night, I couldn't concentrate well throughout the meeting.

V+는 터라 (ongoing)

V+(으)ㄴ 터라 (completed)

A+(으)ㄴ 터라

N+인 터라 (also V + 던/(으)려던 터라)

지치다 → 지친 터라, 일하다 → 일하는 터라, 바쁘다 → 바쁜 터라, 학생 → 학생인 터라

The second clause cannot be a command or suggestion (-(으)세요, -(으)ㅂ시다); use -(으)니까 for that.
Mark tense on the modifier, not with 았/었 + 는: use 는 for an ongoing situation, (으)ㄴ for a completed one; 았던 터라 is possible, but *았는 터라 is not.
It sounds bookish; in casual conversation -아서/-어서 or -(으)니까 is usually more natural.
The reason is usually a state the speaker already knows about, and the result follows from it naturally, not as a surprise.

Wrong: ~~아직 몸이 안 좋은 터라 오늘은 집에서 쉬세요.~~

Right: 아직 몸이 안 좋으니까 오늘은 집에서 쉬세요.

-(으)ㄴ/는 터라 cannot be followed by a command; to give advice based on a reason, use -(으)니까.

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