The Fourth Lesson from Kevin Today I had my fourth lesson from Kevin. Kevin is an American teacher. He taught us some common idioms used by Americans, such as Lost his marbles, brand-spanking new, couch potato, etc. Some of them are familiar to us, but some are not. I think idioms are very important for us, especially for spoken language. During the lesson, Kevin introduced an English programme called Good Mythical Morning. I found it very interesting, although I didn't understand it completely.