Intended as a practical aid to teachers, the fourth edition Teacher`s Guide provides a wide range of resources for teachers - from notes on the content of a unit and how to approach the exercises, to suggestions for classroom activities and answers for all the exercises in the Student Book. The fourth edition Teacher`s Guide has been greatly expanded to include such features as: Ten thematic PowerPoint lessons to provide reading-based review of key grammar structures; Step-by-step instruction for exercises and all of the charts; Background Notes Boxes with suggestions and pedagogical notes to assist with lesson planning; Expansion Activities that promote independent, active use of the target structure; Optional Vocabulary for many of the exercises; A comprehensive Student Book answer key.