A further assumption is that langua

A further assumption is that language is a communal possession that people use, and not an abstract, self-sufficient system. One especially relevant fact of language when viewed from this perspective is that no individual uses language the same way all the time. The variation represented by different speech or language varieties is highly structured and regulated. Thus, any variation associated with language use, whether pronunciation, intonation, vocabulary, rhetorical choices, or sentence and discourse structure, has limits.