だった、確か

確かあの人だった、確か先生だ。

I’m pretty sure it was them—I think they’re a teacher.

確かあの店だった、確かこの道だ。

That was definitely the shop, and this must be the road.

確かあの映画だった、確か面白い。

I think it was that movie—the one that was interesting, if I remember correctly.

確かあの本だった、確か青い表紙だ。

I'm pretty sure it was that book—the cover was blue, I think.

確かここだった、確か二階だ。

I’m pretty sure it was here—on the second floor, I think.