I had …
Mi ero dimenticato che c'era la sua festa.
I had forgotten that their party was happening.
— Quei bravi ragazzi (1990)
Io a te mi ero abituato, se mi pianti ora, che faccio?
I’d gotten used to you. If you leave me now, what am I supposed to do?
— Duck, You Sucker (1971)
Mi ero completamente dimenticato di saper parlare francese.
I had completely forgotten that I knew how to speak French.
— La vita straordinaria di David Copperfield (2019)