立ってた

was standing, were standing

→ 立つ
立っ stand + て Te-form (conjunctive form) + た Past tense
verb · informal, past tense Rare #32,017
was standing, were standing Colloquial contraction of 立っていた.
JA: 彼は入口の前に立ってた。
EN: He was standing in front of the entrance.
Conjugation of 立つ
Indicative past
立ってた

私は彼の隣に立ってたわ。

I was standing next to him.

彼の隣に立ってたよ。

I was standing next to him.

そういえば叔父さん後ろに立ってたけどお酒のにおいがした

Come to think of it, my uncle was standing behind me, and I could smell alcohol on him.

— グエムル -漢江の怪物- (2006)

ここに立ってたそれから手をここに置いてこう言った“もうダメだ”

I stood here, then put my hand here and said, “I can’t do this anymore.”

— フィフス・エレメント (1997)

家へ帰ったんじゃ…じゃなくてどこに立ってた?

You didn’t go home… no, where were you standing?

— サイコ (1960)

驚いたことに君がそこに立ってた

To my surprise, you were standing there.

— マルホランド・ドライブ (2001)