New Headway: Elementary Third Edition: Teacher's Book: Six-level general English course for adults by John Soars
The book gives you full notes for teaching the material effectively, plus lesson hints and suggestions. There are 'possible problems' boxes too, which draw your attention to the mistakes students might make. Stop and Check sections and Progress Tests help you assess students' progress throughout the course, and the photocopiable pages give you extra activities and ideas for every unit.