You can put the words Que, Qui, Quand, Où, Pourquoi, and Comment in front of est-ce que. Qu’est-ce que tu fais? = What are you doing? Qui est-ce qu’il est? = Who is he? Quand est-ce qu’ils sont arrivés? = When did they arrive? Où est-ce qu’on peut trouver le marché? = Where can one find the market? Pourquoi est-ce qu’elle t’a blessé? = Why did she hurt you? Comment est-ce que vous allez fair ça? = How are you going to do that?