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Phonological change in a small language community

Bullock and Gerfen show that two of the last speakers of French in Frenchville, Pennsylvania, systematically replace the French front mid round vowel (in words like deux, neuf) with the rhoticized schwa of American English, their dominant language. As the authors argue, it is unlikely that this sound change would have arisen in the speech of French speakers who were not bilingual in English.