- Easy and enjoyable to teach, Touchstone is packed with new and exciting ideas, offering a fresh approach to the teaching and learning of English. Workbook 4A provides follow-up exercises for each 2-page lesson of units 1-6 in Student"s Book 4A, allowing for a thorough practice of new vocabulary, structures, and conversation strategies and providing extra reading and writing activities. A progress chart at the end of each unit helps students evaluate their progress and plan further study.