This paper examines changes in the functional distribution of five languages, Atayal, Southern Min, Hakka, Mandarin and Japanese in Taiwan based on a survey the author conducted on four ethnic groups. The results show four types of reorganization in language use. (1) Language shift; Mandarin has been replacing the languages Atayal and Hakka in the following order: 'public settings', 'mental arithmetic/praying', 'neighborhood', 'family'. (2) Bilingualism; In respect to Southern Min, Mandarin has not been having such a strong influence. The use of both Southern Min and Mandarin can be observed in this group. Southern Min is also used by other groups in 'public settings', where it seems to be competing with Mandarin. (3) Language maintenance; Mandarin is the dominant language for Mainlanders although they also use Southern Min in some domains. (4) Lingua franca; Japanese, which is still used among older informants, functions as a lingua franca, an argot, and a language of mental arithmetic.
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