I don't understand you
Francamente, no te entiendo, Alexandre.
Frankly, I don't understand you, Alexandre.
— La Nuit américaine (1973)
Estás hablando demasiado rápido, no te entiendo nada.
You're talking too fast, I can't understand anything you're saying.
Que me hables en cristiano que no te entiendo.
Speak to me in plain language—I don't understand you.
— También la lluvia (2011)
No te entiendo, hablamos lenguajes distintos.
I don't understand you; we're speaking different languages.
— Simón del desierto (1965)