The Teacher's edition is essentially an enhanced version of the Student's Book, providing streamlined tools for classroom management and assessment:
The simple answer key in the back of a student book says: 1. have known . The Teacher’s Book says: 1. have known (Present Perfect – emphasis on duration from past to present; 'since' triggers this). It provides the you need on the fly. grammar and vocabulary practice b1 teacher 39-s book vk
: The book is organized into 24 units , 8 revision units, and one final comprehensive revision unit. Core Content & Unit Structure The Teacher's edition is essentially an enhanced version