tu ne comprends pas
You don't understand what Mary is trying to say.
Tu ne comprends pas ce que Mary essaie de dire.
I guess you don't understand English.
Je suppose que vous ne comprenez pas l’anglais.
— Mulholland Drive (2001)
You don't understand what Mary's trying to say.
Tu ne comprends pas ce que Mary essaie de dire.
You don't understand why we worry.
Tu ne comprends pas pourquoi nous nous inquiétons.
— The White Ribbon (2009)
You don't understand what's happening.
Tu ne comprends pas ce qui se passe.