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erano stati

had been

→ essere
phrase Rare #39,394
had been Used to form the past perfect passive with a plural subject.
IT: I documenti erano stati spediti ieri.
EN: The documents had been sent yesterday.

Cinquecento dei quali erano stati fatti cavalieri solo ieri.

Five hundred of whom had been knighted only yesterday.

— Enrico V (1989)

I fornitori, tranne me, erano stati pagati alla consegna o anche prima.

The suppliers, except for me, had been paid on delivery or even earlier.

Ai tre gemelli erano stati assegnati alloggi perfettamente identici.

The three twins had been assigned perfectly identical accommodations.

Erano stati avvelenati.

They had been poisoned.

Quando mi svegliai i miei capelli erano stati tagliati.

When I woke up my hair had been cut.

— Old Boy (2003)