Highly versatile, this series allows you to flip to the exact grammar structure you want to study, review it, and then practice it within minutes! Each of the 133 units is a two-color, two-page spread, with presentation of grammar points on the left-hand page and practice exercises on the right. Main topics cover the present and past tenses, the present perfect and past, the future, modals, conditionals, passive, reported speech, articles and nouns, pronouns and determiners, relative clauses, adjectives and adverbs, conjunctions and prepositions, and phrasal verbs. A fun interactive Bonus CD-ROM! with more practice, listening exercises, a create-your own tests feature, and grammar games is packaged with the student books and both the student book and workbook are available with or without the answer key. The with-answers editions include study guides that can be used for diagnostic purposes.