would know, would be able to tell, would know how to
Si la hubiese matado, sabría que es una trampa.
If I had killed her, I would know it's a trap.
— Ne le dis à personne (2006)
Así sabría si había llamado alguien.
That way I would know if someone had called.
— Pacto de sangre (1944)
Bueno, al menos sabría cómo llamarte.
Well, at least I'd know what to call you.
— El Guardián: Último Refugio (2026)
No le sabría decir exactamente.
I couldn't tell you exactly.
Tom pensó que Mary sabría dónde estaba John.
Tom thought Mary would know where John was.
Sabría que se estaría aprovechando de usted.
I would know that he was taking advantage of you.
— Psicosis (1960)