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terá sido

must have been

→ ter
phrase Rare #37,410
must have been Used to guess or speculate about something in the past.
PO: Ele terá sido o primeiro a chegar.
EN: He must have been the first to arrive.

Quem terá sido?

Who could it have been?

— O Homem da Terra (2007)

Terá sido Beatrice?

Could it have been Beatrice?

— Rebecca, A Mulher Inesquecível (1940)

Não terá sido a você que enganaram?

Could it be that you were the one who was deceived?

— Mulheres à Beira de um Ataque de Nervos (1988)

Não terá sido metade que você prometeu?

Was it only half of what you promised?

— O Auto da Compadecida (2000)

Assim, terá sido contra um adversário de valor.

Thus, it will have been against a worthy opponent.

— Don Juan DeMarco (1994)