Detailed lesson on when to use de by itself as opposed to du, de la, or des. - Lawless French. I don't understand why people sometimes use ' du ' instead of 'des' Use du (masculine) or de la (feminine) followed by a singular noun for. Du or Dû. The article Du and the past perfect Du shall not be mistaken. Du (article) = contracted form of de +le. J'ai du travail à faire ce soir. (I have some work to. Questions in French What is your name? Join them; it only takes a minute: Questions Tags Users Badges Unanswered. Du fromage is the singular form, and uno kostenlos online fromages is the plural form. Get downloadable audio lessons, tests and games, our pronunciation-perfecting voice recognition tool and more Firstly, DE and DU are not interchangeable. Stay up to date with Lawless French!