As social beings, we interact each other. One kind of interaction is by communicating. In communicating, we need language so that we can convey our ideas, desires, intentions and purposes to others. This is called language function. The functions of language are important in our live. According to Bruce Tillit and Mary Newton Brother, there are eleven functions of language we usually use in our daily conversation. They describe it in their book entitled: Speaking Naturally: Communication Skill in American English (1985). Besides of language functions, there is another thing which also has important role in communication that is language styles. We can know the background of a person through the style of the language he/she used. According to Martin Joos (1976,) there are five types of language styles, whereas according to Mandell and Kirzner (2003), there are four types of language styles. This study aims to analyze the language functions used by vendors at Legian beach as well as to find the style of language they use in their conversations with tourists. The results of this research indicate that eight of the eleven language functions proposed by Bruce Tillit and Mary Newton Bruder were used by vendors at the Legian beach in their conversations with tourists. The most common language functions they use are the language functions of getting information and controlling the conversation. There are four types of language styles they use in communicating with tourists. From those four styles of language, they mostly used informal style.

This undergraduate thesis entitled “Analysis of Code Switching in Dialogue of Indonesian Novel Permainan Maut by Lexie Xu” has two aims which are; to analyze the types of code switching and the functions of code switching that is found in the novel. The data source that is used in this study is a novel entitled Permainan Maut by Lexie Xu. It was chosen as the data because there are many characters who come from different social background that makes them often to talk in various languages. This phenomenon could help to analyze on how code switching works in every dialogues.   The data was collected using documentation method and analyzed using theory from Wardhaugh (1986) in his book entitled An Introduction to Sociolinguistics to analyze the types of code switching and from Appel & Muysken (1987) in his book entitled Language Contact and Bilingualism to analyze the functions of code switching.  Furthermore, it is presented in informal method using words to explain the type and function of code switching used by the character in their dialogue. The result of this study explains that Situational Code Switching is more dominant to be used than Metaphorical code switching. Not all functions of code switching can be found in these dialogues. Only four out of six are used, they are: Referential Function, Metalinguistics Function, Phatic Function and Expressive Function.

The undergraduate thesis is entitled “The Analysis of Code Switching in the Novel “Critical Eleven” By Ika Natasha”. The aim of this study is to analyze type and function of code switching in the novel. The novel entitled “Critical Eleven” was chosen because this novel is a great novel and the dialogues use many code switchings. There are two problems to be investigated: First,  What types of code switching were found in this novel? And the second one What kinds of function of code switching were applied in this novel? The method used in collecting data was the documentation method and the data were analyzed using the theory proposed by Muysken in “The Cambridge Handbook of Sociolinguistics”. The result of this study shows that there were seventeen examples of tag switching, twenty four examples of inter sentential switching and fifty six examples of intra sentential switching. There were six examples of emotive function, two examples referential function, four examples of phatic function, five examples of metalinguistic function and only one example of poetic function but the conative function was not found.