I had a teacher in high school and her voice was so high and it sounded like she was going to cry at any moment. Very annoying, well it was a simple class, I had to disconnect it most of the time. The first habit of very boring teachers is to speak with the same tone of voice all the time. In this FREE guide on how to avoid boring your students, I included some interesting activity planners PLUS a list of 20 ways to keep your students engaged.
The lack of student participation, a lot of bad student behavior, honest feedback from real teacher friends helped me realize that I had some unhealthy teacher habits. It contains some valuable insights from teachers who have experimented with how their tone of voice affects the functionality of their classrooms. I loved biology, but my teacher spoke like the stereotypical, too strict and evil elementary school teacher.