摘要：The human needs to communicate with the outside world to remove his needs, that's why the language is formed. The nature of language is the nature of human thought and human action, for language is no more nor less than the tool of both of these aspects of human nature. A word is either the shadow of an act or of an idea. Verbal sounds have no meaning in themselves. They are the channels, the media for the expression or communication of that which lies outside of themselves. Due to importance of communication, it can be said that learning a language is necessary. So it is essential to know the factors that are important for language teaching. Materials are factors that have an important role in language teaching.
