- The second edition contains new units, more exercises, and a free Audio CD with recordings of example sentences so students can hear the grammar structures they are learning. Each of the 116 units in the Student"s Book is presented in a two-page spread, with simple, clear explanations on the left-hand page and practice exercises to check understanding on the right. This new edition includes an Audio CD with example sentences, ten units of new material, more exercises per unit, and a new section of Additional Exercises that give students the opportunity to consolidate what they have learned. An answer key is included (an edition without answers is also available). Basic Grammar in Use, Second Edition, can be used as a class text or for self-study. Teachers using a main course book in lower-level classes may wish to assign this text as a reference guide so that students can look up grammar points that cause them difficulty. A Student’s Book with an answer key included is also available.