tu parles de
This person you're talking about wouldn't be my daughter, would it?
La personne dont tu parles ne serait pas ma fille, par hasard ?
— The Wind Rises (2013)
I haven't read the book you're talking about.
Je n’ai pas lu le livre dont tu parles.
I don't understand what the fuck you're talking about.
Je ne comprends pas de quoi tu parles, putain.
— The Machinist (2004)
I don't know what the hell you're talking about.
Je ne sais pas de quoi tu parles, putain.
— Dead Poets Society (1989)
I don't know who you're talking about.
Je ne sais pas de qui tu parles.
You're talking about the mafia, son?
Tu parles de la mafia, fiston ?
— Elite Squad: The Enemy Within (2010)
I have no clue what you're talking about.
Je n’ai aucune idée de ce dont tu parles.
I haven't yet read the book you're talking about.
Je n’ai pas encore lu le livre dont tu parles.
She doesn't know the title of the book you're talking about.
Elle ne connaît pas le titre du livre dont tu parles.