adv (in questions)
pourquoi
Why did you do that? Pourquoi avez-vous fait ça?
Why is he late? Pourquoi est-il en retard?
Tell me why. Dis-moi pourquoi.
I've never been to France. -- Why not? Je ne suis jamais allé en France. -- Pourquoi?
All right, why not? D'accord, pourquoi pas?
excl
(=well!) tiens!
→ Why, isn't that your mother over there?
→ Why, I never knew they had such a big garden!