The math teacher of my class is a young man. His name is Jiang Shan. He is tall and fat. We call him the "Big Guy". When he knows it, he isn't angry and says it's lovely. He is easy going and interesting. We can make jokes with him. But about our study, he is serious but patient. We can’t be sloppy on our study. When we have questions, we can ask him anytime. He is a good teacher.