The Grammar Files series consists of 4 Books, 64 pages each, for CEF Levels: A1 - A2 - B1 - B2 - C1. Each unit starts by briefly introducing the new Grammar point and then students have to practise doing a variety of exercises. These books can also be used as time fillers; perfect for when teachers have some extra time at the end of a lesson, or want to revise a specific Grammar point.