Consider this example.
I wanted to begin with a recap of the previous lesson using pair discussion. There were some discussion prompts and question on the desks to get them started. However they didn’t settle very well, and one boy was so disruptive that I had to send him out. They didn’t really answer the questions and in the end I had to quieten the class and remind them what had happened in the previous lesson as well as telling them that I wasn’t very pleased with their attitude. They did finally settle down to the main task, which was reading and understanding a source text, and then the lesson went quite well.