Lib and Libby A - Grammar and Vocabulary Activities includes 15 units. Each unit is divided into two lessons. Every three units there is one Revision unit, that is, five Revision Units on the whole. T here is a complete Glossary of the vocabulary presented in both Pupil’s Book and Grammar and Vocabulary Activities. There is a complete Glossary of the vocabulary presented in both Pupil’s Book and Grammar and Vocabulary Activities.