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いたみたい

seems to have been, seems to have been doing

→ 居る
い be; be present + た Past tense + みたい Seemingly; it seems that
auxiliary · informal, past tense Rare #39,692
seems to have been, seems to have been doing Informal form of いる + みたい, used after a verb in the て-form to say that something seems to have been happening or true.
JA: 彼はずっと待っていたみたい。
EN: It seems he had been waiting the whole time.
Conjugation of 居る
Subjunctive past
いたみたい

そう決心していたみたい

It seems they’d made up their mind to do that.

— When Marnie Was There (2014)

あの頃の記憶を失っていたみたい

It seems I had lost my memories from that time.

— ラスト、コーション (2007)

まるで本当にここに住んでいたみたい

It's as if I really used to live here.

— When Marnie Was There (2014)

誰かを捜していたみたいだったよ

It seemed like they were looking for someone.

— ロード・オブ・ザ・リング (2001)