doesn't know anything
You don't know anything?
Acho que você não sabe de nada.
I don't think you know anything.
Não, ela não sabe de nada também.
No, she doesn't know anything either.
— A Vingança de Manon (1986)
Se te perguntar algo de Paco, você não sabe de nada.
If I ask you something about Paco, you know nothing.
— Volver (2006)
My dad doesn't know anything.
Ela não sabe de nada do mundo.
She knows nothing about the world.
— O Conto da Princesa Kaguya (2013)
Pensou saber tanto, mas não sabe de nada.
He thought he knew so much, but he knows nothing.
— Morangos Silvestres (1957)