있었지만

was ...ing, but, there was, there were ... but, had ... but

→ 있다
auxiliary · past tense Uncommon #9,750
was ...ing, but Used after a verb stem with -고 to describe an ongoing past action, followed by a contrast.
KO: 비가 오고 있었지만 우리는 산책했어요.
EN: It was raining, but we went for a walk.
Conjugation of 있다

파벨을 기다리고 있었지만 그는 오지 않았지

I was waiting for Pavel, but he never came.

— 레베카 (1940)

나는 깨어 있었지만 아무것도 볼 수 없었고, 아무 소리도 들을 수 없었다.

I was awake, but I couldn’t see anything or hear a sound.

하지만 반대 방향 인 바르셀로나에서 마드리드로 난 도망치고 있었지만 혼자는 아니었다

But I was fleeing in the opposite direction, from Barcelona to Madrid—and I wasn’t alone.

— 내 어머니의 모든 것 (1999)

발코니에는 망원경이 놓여 있었지만, 그걸 쓰면 맞혀 보는 재미가 사라질 터 였다.

There was a telescope on the balcony, but using it would take all the fun out of guessing.

verb · past tense Uncommon #12,298
there was, there were ... but Past form of 있다 followed by -지만 (“but”).
KO: 시간이 있었지만 가지 않았어요.
EN: There was time, but I didn’t go.
had ... but Past form of 있다 followed by -지만 (“but”).
KO: 저는 돈이 있었지만 사지 않았어요.
EN: I had money, but I didn’t buy it.
Conjugation of 있다

그런 사람이 있다는 건 뻔히 알 수 있었지만.

It was obvious that someone like that existed, though.

어머니는 있었지만 시체 였어요

My mother was there, but she was a corpse.

— 싸이코 (1960)

내가 놓치고 있는 중요한 뭔가가 있었지만, 어쨌든 나는 다른 질문 하나를 찾아냈다.

I was missing something important, but anyway, I found another question.