you don't understand anything
Todos hablan raro, no entiendes nada.
Everyone speaks strangely, you don't understand anything.
— La vida es bella (1997)
No entiendes nada en absoluto.
You don't understand anything at all.
De todas formas, no entiendes nada.
Anyway, you don't understand anything.
— La noche americana (1973)
Cameron, ¿no entiendes nada?
Cameron, don't you understand anything?
— El club de los poetas muertos (1989)