An application that I use to help students learn how to answer questions is: Question Builder. It targets What, Where, Why and How questions. There are 3 levels of difficulty to use as a student makes progress. The application also keeps statistics on a students accuracy in responding to questions. The students like the reinforcement they received every 2 questions when a fun character appears on the screen to motivate them. This application is $5.99. Below is a link to the Apple description:
Question Builder
Question Builder