sarebbe potuto

could have

→ essere
phrase Uncommon #20,003
could have Used with a past participle to express a possibility or ability in the past that did not happen or is being considered hypothetically. The form changes according to the subject and gender/number: sarei potuto, sarebbe potuta, sarebbero potuti.
IT: Sarebbe potuto venire con noi, ma aveva troppo lavoro.
EN: He could have come with us, but he had too much work.

Come sarebbe potuto uscire fuori dall'acqua?

How could he have gotten out of the water?

— Non dirlo a nessuno (2006)

Parenti più vicini dove sarebbe potuto andare?

Closest relatives—where might he have gone?

— Loveless (2017)

In ogni caso, sarebbe potuto venire al funerale.

In any case, he could have come to the funeral.

— Thirst (2009)

Pensa che sarebbe potuto arrivare a quei livelli?

Do you think he could have reached those levels?

— Le invasioni barbariche (2003)

Sarebbe potuto morire.

He could have died.