could have been
En cualquier caso, fuera lo que fuera, no pudo haber sido grave.
In any case, whatever it was, it couldn't have been serious.
— Cónclave (2024)
Pudo haber sido Tom.
It could have been Tom.
Creo que pudo haber sido una buena persona.
I think he could have been a good person.
— Bacurau (2019)
Tom pudo haber sido el primero si solo preguntara.
Tom could have been the first if only he had asked.