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In linguistics, code-switching occurs when a speaker alternates between two or more languages, or language varieties, in the context of a single conversation. Multilinguals—speakers of more than one language—sometimes use elements of multiple languages when conversing with each other. Thus, code-switching is the use of more than one linguistic variety in a manner consistent with the syntax and phonology of each variety. Code-switching is distinct from other language contact phenomena, such as borrowing, pidgins and creoles, loan translation (calques), and language transfer (language interference). Borrowing affects the lexicon, the words that make up a language, while code-switching takes place in individual utterances. Speakers form and establish a pidgin language when two or more speakers who do not speak a common language form an intermediate, third language. On the other hand, speakers practice code-switching when they are each fluent in both languages. Code mixing is a thematically related term, but the usage of the terms ''code-switching'' and ''code-mixing'' varies. Some scholars use either term to denote the same practice, while others apply ''code-mixing'' to denote the formal linguistic properties of language-contact phenomena, and ''code-switching'' to denote the actual, spoken usages by multilingual persons. In the 1940s and 1950s, many scholars considered code-switching to be a sub-standard use of language. Since the 1980s, however, most scholars have come to regard it as a normal, natural product of bilingual and multilingual language use.〔 * *〕〔Brice, A. & Brice, R. (2009). (Ed.s). Language development: Monolingual and bilingual acquisition. Old Tappan, NJ: Merrill/Prentice Hall.〕 The term "code-switching" is also used outside the field of linguistics. Some scholars of literature use the term to describe literary styles which include elements from more than one language, as in novels by Chinese-American, Anglo-Indian, or Latino writers. In popular usage, ''code-switching'' is sometimes used to refer to relatively stable informal mixtures of two languages, such as Spanglish, Franponais or Portuñol.〔 Both in popular usage and in sociolinguistic study, the name code-switching is sometimes used to refer to switching among dialects, styles or registers, as practiced by speakers of African American Vernacular English as they move from less formal to more formal settings. ==Social motivations== Code-switching relates to, and sometimes indexes social-group membership in bilingual and multilingual communities. Some sociolinguists describe the relationships between code-switching behaviours and class, ethnicity, and other social positions.〔See: * * *〕 In addition, scholars in interactional linguistics and conversation analysis have studied code-switching as a means of structuring speech in interaction. Some discourse analysts, including conversation analyst Peter Auer, suggest that code-switching does not simply reflect social situations, but that it is a means to create social situations. ===Markedness model=== The Markedness Model, developed by Carol Myers-Scotton, is one of the more complete theories of code-switching motivations. It posits that language users are rational, and choose to speak a language that clearly marks their rights and obligations, relative to other speakers, in the conversation and its setting. When there is no clear, unmarked language choice, speakers practice code-switching to explore possible language choices. Many sociolinguists, however, object to the Markedness Model’s postulation that language-choice is entirely rational. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Code-switching」の詳細全文を読む スポンサード リンク
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