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tinham sido

had been

→ ter
phrase Rare #39,091
had been Used to form the pluperfect passive, describing something that had happened to someone or something before another past event.
PO: Os documentos tinham sido encontrados antes do amanhecer.
EN: The documents had been found before dawn.

Eles tinham sido derrotados em batalha.

They had been defeated in battle.

Me senti aliviado quando todos os problemas tinham sido resolvidos.

I felt relieved when all the problems had been resolved.

Os registros tinham sido queimados.

The records had been burned.

Tinham sido envenenados.

They had been poisoned.