My adult ESL learners have often forgotten the basics as they advance in their English, and one of the most common issues is when and how they must add "Do" to negative statements, yes/no questions, and Wh-questions. I constructed this packet for them. There is a practice worksheet included in the packet. Many other handouts, including this one, are contained in my book, "Let's Look At It This Way!", which is available in my store. It's actually a pretty good deal. For the cost of a few handouts, you get 50+ to reproduce for your instructional and classroom use.