This PowerPoint contains 21 stem-changing (boot) verbs. The list is from Lesson 4 of the Descubre 1 textbook, but they're pretty standard for most texts. These include: cerrar, dormir, pensar, perder, preferir, etc. The first several slides explain how the "radical" changes work. After that, it is more to help remember these verbs in terms of meaning. The final section is remembering the meaning, but also putting together how to conjugate the verbs themselves as there is a sentence/conjugation required on each slide. These are numbered so you could have students write them down. They are animated to pop up with the answer, too. It has worked great for me in the classroom. I also have a 2-page note-taking document to help students to write down the key points. Please check out my store for further documents and information. Many thanks for looking!