間違ってました

was wrong, was mistaken

→ 間違う

間違っ be mistaken, be wrong, make a mistake + て Te-form (conjunctive) + まし Polite past + た Past tense

verb · past indicative Rare #39,109

was wrong, was mistaken

JA: すみません、私が間違ってました。

EN: I'm sorry, I was wrong.

Conjugation of 間違う

Indicative past

I was wrong…

— तुम्बाड (2018)

We were wrong.

I was wrong.

Was I wrong?

— 新感染ファイナル・エクスプレス (2016)