TESOL Videos - Authentic non authentic materials

In this unit two videos are shown of an ESL teacher who is teaching in class. In the first video, the students clearly seem not to understand much and the therefore are inactive. This is problem because of the teachers approach in class. He starts his lesson with grammar instead of vocabulary, he assumes everything is easy for the students. In the second video, the students are active and understand him much because he starts with vocabulary and pairs the students to do their class work on pairs.