one has to know
I know everything there is to know.
Cuando se hace una apuesta, hay que saber perder.
When you make a bet, you have to know how to lose.
— Astérix & Obélix : Mission Cléopâtre (2002)
Sabrán todo lo que hay que saber sobre el Hombre"D".
They’ll know everything there is to know about the man called “D.”
— El Quinto Elemento (1997)
Escucha, hay que saber adónde van.
Listen, we need to know where they're going.
— Suspiria: Alarido (1977)
Tom sabe todo lo que hay que saber sobre autos italianos.
Tom knows everything there is to know about Italian cars.
You just have to know how to read it.
— Los ilusionistas 3: Ahora me ves, ahora no (2025)
Hay que saber quiénes eran los amigos de Vanessa.
We need to know who Vanessa's friends were.
— Tesis (1996)
Solo hay que saber si alguno de nosotros es uno de ellos.
We just need to know if any of us are one of them.
— Pecadores (2025)