閉まってた

was closed

→ 閉まる
閉まっ Past/te-form stem of intransitive 閉まる + Te-form (conjunctive) + Past tense
verb · past indicative Rare #28,314
was closed Colloquial contraction of 閉まっていた.
JA: 店に行ったら、もう閉まってた。
EN: When I went to the store, it was already closed.
Conjugation of 閉まる
Indicative past
閉まってた

ドアが閉まってたのは初めてだ

It was the first time I'd ever seen the door closed.

— ファイト・クラブ (1999)

学校が閉まってた

The school was closed.

— ほんとうのピノッキオ (2019)

ドアは閉まってた

Was the door closed?

銀行は閉まってた

Was the bank closed?

窓は閉まってた

Was the window closed?

タイラードアが閉まってた

Tyler's door was closed.

— ファイト・クラブ (1999)