Genres

I have really been looking over data this last week from my Winter MAP test. As I have been looking over the data, I have sat down with my big binder for small groups and assessments and really looked at the key ideas they should be working on to get to the next level. It was really interesting that especially those higher kids how much they need to know about genre. It is confusing to me at times as an adult the difference between all the genres and how they fit into the categories. Does anyone have a good idea for teaching genre to the younger grades?