and that's why
Y por eso es un asesino múltiple.
And that's why he's a serial killer.
— Un lugar en ninguna parte (1988)
El amo trataba bien a sus empleados y por eso todos lo respetaban.
The master treated his employees well, and that's why everyone respected him.
Alguien ha hecho algo y por eso nos tienen encerrados.
Someone has done something, and that's why they're keeping us locked up.
— [REC] (2007)
Te has dejado abierta la puerta, y por eso entra tanto frío en la habitación.
You left the door open, which is why so much cold air is coming into the room.
Ahora él sabe que la criada lo sabe, y por eso desconfía.
Now he knows that the maid knows, and that's why he's suspicious.
— Divorcio a la italiana (1961)
No podía verlo, y por eso no creía en él.
He couldn't see it, and that is why he didn't believe in it.
— Secret Sunshine (2007)