Code-switching has often been described as a conversational strategy. Sometimes this strategy is discussed in terms of stylistic effects, that is, in terms of its use in aggravating or mitigating such conversational acts as requests, denials, topic shifts, elaborations or comments, validations, or clarifications (Gal 1979; Gumperz and Hernandez-Chavez 1971; Gumperz 1982a,b; Zente11a 1981; Valdes 1981; McClure 1981; Genishi 1981).
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Monica Heller (1988) studied this question.