ne sais quoi

don't know what

→ ne

phrase Rare #37,149

don't know what Usually followed by an infinitive: je ne sais quoi faire means “I don't know what to do.” The verb changes with the subject and tense, as in il ne savait quoi dire.

FR: Je ne sais quoi choisir pour le dîner.

EN: I don't know what to choose for dinner.