Topics: Sociolinguistics, Sociology of Language, speech communities, Bilingualism, Diglossia, code switching, code mixing, Language Maintenance, language shift, Language Planning, social class

Topics: Language, language study, language use, speech communities, phoneme, phonetic structure, grammatical forms, sentence types, syntax, morphology, morphologic types, substitution, form classes, lexicon, written records, comparative method, dialect geography, phonetic change, analogi change, semantic change, cultural borrowing, intimate borrowing, dialect borrowing

Topics: Sociolinguistics, varieties of laguage, language, culture, thought, speech, socal interaction, study of speech, lingustic inequality, social inequality, theoretical summary