—To teach children group work.

Thomas Edison didn't take much school （教育）. He only stayed in school for three months. During that time, he asked his teacher many questions. His teacher couldn't （解释）them to him. His teacher thought he was （愚蠢的）and asked his mum to take him out of school. Edison's mum brought him home and began to teach him in （亲自）. With Mum's help, Edison learned how to read and write. His mum's （目的）was to improve his basic reading and writing skills However, （随着）Edison grew older, his mum found he had many ideas and he liked doing （研究）on science. It （似乎）that he was more interested in science than （任何事情）else. His mum （鼓励）him to try out his ideas.