G9. Green Line. Get connected. The training book is perfectly aligned with the textbook Green Line 4 G9 and is suitable for independent learning in the afternoon: Lesson by lesson, what has been learned with the textbook is reviewed. Ideal for practicing, revising, and consolidating all areas of learning (vocabulary, grammar, listening, reading, writing, mediation, and speaking). Includes practice materials for the summer holidays to ease the transition into the new school year. With tips and strategies. Access to the media collection with all audios and detailed solutions.