The language is a communication medium which let everyone express a thought, a need, feelings, and ideas. It universality leads a whole society. Sociolinguistic studies language mechanism in terms of language choice according to the individuals, social role in a society and the variations according to social, geographical constraints. So it involves different language varieties depending on whether people are at home, in family, or at school or work. So the issue is: What factors are involved in their decisions about which variety to use? First of all; we will tackle on the notion of code switching and prestige with the idea of the language as a social difference mirror, secondly we will deal with the language choice in term of synonyms and semantic change. Finally we will deal with the notion of discourse variation depending on the purpose of a speech and its addressee.
The code switching is a combination of two or more linguistic codes as different languages, dialects or language style. It can occur in a discourse, a dialog or even in the middle of a sentence. The reasons are diversified: the speech topic, the humor of the speaker, the relationship between the speakers (leading a bond for example) and common values of a cultural origin. The focus will now shift to a Spanish/English codes witching in USA Latinos communities which is often called “Spanglish”. A linguist found that despite its low prestige, codes switching is important for signaling social identity. Let’s take the example of an immigrant Mexican family in the USA with a teenage girl , as she’s bilingual because she learnt English at school she would prefer speak English to her siblings, she would switch to Spanish for her grand-parents to show her respect toward them. But she can refuse to switch to Spanish for her parents as she shows a rebellion which is emphasized by a non mutual dialog, the American movie Real Women have curves directed by Patricia Cardoso is about Ana Garcia a