fomos nós que

it was us who

→ ser
phrase Rare #33,428
it was us who An emphatic construction used to identify who performed an action. The form changes with tense and subject, as in “somos nós que” (we are the ones who) and “seremos nós que” (we will be the ones who).
PO: Fomos nós que reservamos a mesa.
EN: We were the ones who reserved the table.

Não fomos nós que começamos a porra do tumulto!

We didn't start the damn riot!

— Controle: A História de Ian Curtis (2007)

Eu sei que o Tom não sabia que fomos nós que fizemos isso.

I know Tom didn’t know that we were the ones who did it.

Não fomos nós que fizemos isso.

We weren't the ones who did that.

Fomos nós que encontramos o tesouro.

We were the ones who found the treasure.