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通ってた

was passing through, used to pass through

→ 通る
通っ pass through, go through + て Te-form (conjunctive) + た Past tense
verb · imperfect indicative Rare #38,867
was passing through, used to pass through Colloquial contraction of 通っていた.
JA: 毎朝、この道を通ってた。
EN: I used to pass through this street every morning.
Conjugation of 通る
Indicative imperfect
通ってた

通ってた高校って、大きかった？

Was the high school you went to big?

（千果）うちの通ってた中学校あの場所にあったんよ

(Chika) The middle school I went to used to be right there.

— すずめの戸締まり (2022)

昔はこの教会に通ってたよ。

I used to attend this church.

通ってた学校って、大きかった？

Was the school you went to big?