There are three ways to ask a yes/no question. In everyday speech, just raise your voice: Tu parles français ? In neutral French, put Est-ce que in front: Est-ce que tu parles français ? In formal French and writing, invert the verb and pronoun and join them with a hyphen: Parles-tu français ? With il/elle/on, if the verb ends in a vowel, add -t-: Parle-t-il français ?

Question words: qui (who), que/quoi (what), où (where), quand (when), comment (how), pourquoi (why), combien (how much), quel/quelle (which). They can sit at the start (Où habites-tu ? Où est-ce que tu habites ?) or, in speech, at the end (Tu habites où ?). Quel agrees with its noun: quel jour, quelle heure. Answer pourquoi with parce que.

English speakers often copy 'Do you...?' and say Fais-tu... for everything. French has no 'do' in questions; use est-ce que or raise your voice.