This is a simple practice of how verbs remain or change their spelling when the tense changes. Often, students don`t get a lot of practice on all of the words at the back of the third grade English textbook so this will be a good reading and recall practice for them.
Files:
Useful but pretty long. Maybe between each slide add a 'you can do it' slide with an animated gif like you did at the end. Something mildly amusing to keep up interest.
Yes, it is long. I don`t use the entire PPT Slides either. I think the teachers can just select which slides they want to review for a particular class. I would use around three slides just right after the class warm up then move on to another activity.