Interchange Third Edition Combo is a specially adapted revision of Interchange Third Edition, the world's most successful English series for adult and young adult learners. Interchange Third Edition Combo Intro is designed for beginners and for learners needing a thorough review of basic grammar, functions, and vocabulary. The Intro Level provides a solid foundation in the language and is a smooth transition to Levels 1, 2, and 3. The Teacher's Edition provides all of the teaching tips required to deliver fully structured and well-planned lessons.