you don't know what
No sabes lo que te estás perdiendo.
You don't know what you're missing.
No sabes lo que es mejor para ella.
You don't know what's best for her.
— Mañana empieza todo (2016)
No sabes lo que hacen con tipos como yo?
Don't you know what they do to guys like me?
No sabes lo que podía haberte ocurrido.
You don't know what could have happened to you.
— Adiós, muchachos (1987)
No sabes lo que tienes hasta que se haya perdido.
You don't know what you have until it's gone.
You don't know what's there.
Supongo que no sabes lo que es un procurador.
I suppose you don't know what a solicitor is.
— La increíble historia de David Copperfield (2019)