A teacher certainly wants to build a good communication climate with his students, so that students understand what is being conveyed, and make teaching and learning activities enjoyable.
How to create a pleasant atmosphere? The teachers, among other things, are required to be agile in responding to the needs of students, always ready to discuss, and be a good listener of students' learning problems.
However, to implement it all, which is no less important is to provide a clear "rules of the game", and provide opportunities for students to provide feedback..