GROUP PRESENTATION HOW TO WRITE EFFECTIVE CLASSROOM MATERIALS The main aim of this presentation was to do a 20 minutes lesson in which we should present our students (classmates) the teacher and trainer Rachael Roberts and her conference about how to write effective classroom materials. The lesson was structured in three main parts. The first minutes were dedicated to present the central ideas through a Prezi presentation. The second activity was a Kahoot which provided students with some of the vocabulary and knowledge needed for the main task. And finally, we did the main activity which consists in creating a youtube video such as a haul or a make up tutorial. In this way, students had to prepare the video in groups and then they had to perform and record it. After that, they had to upload the video in a Facebook Group ("How to write effective classroom materials?") which was created for this lesson. At the end, we watched all the videos and students voted ...