Understanding And Using English Grammar, Workbook Paperback - Betty S. Azar Workbooks are excellent resources for additional study and practice. They are linked to the grammar charts in the Student Book. The exercises range from the basic to more challenging so students can choose from a variety of exercises that will help them use English meaningfully and correctly. The workbooks can be used as a self-study tool, for additional classwork, homework, testing, or individualised instruction.