This document discusses the different functions of speech communication from three perspectives: the sender's, society's, and receiver's. For the sender, the main functions are to share information, provide instruction, persuade, and entertain. From society's perspective, the key functions are surveillance, correlation, socialization, and entertainment. For the receiver, the major functions are to develop personal identity, facilitate social integration, enhance cognitive abilities, and provide a means of escape. Overall, the document analyzes how speech communication fulfills various important roles for individuals and communities.