what you say
Tené cuidado con lo que decís.
Be careful what you say.
No entendemos nada de lo que decís.
We don't understand anything you're saying.
I don't care what you say.
Tom no pudo haber hecho lo que decís que hizo.
Tom couldn't have done what you say he did.
What you say is true.
Estoy escuchando lo que decís.
I'm listening to what you're saying.