|eastern South America, Caribbean|
Rodrigues (2000) finds evidence relating Macro-Je to Tupian, and Eduardo Ribeiro of the University of Chicago, who has worked with Macro-Je and Tupian languages, has found further that these families share irregular morphology with each other and with Cariban. Shared grammatical irregularities are strong supporting evidence for putative language families, as they are unlikely to be borrowed or to be due to chance.
- Rodrigues A. D., 2000, "‘Ge–Pano–Carib’ X ‘Jê–Tupí–Karib’: sobre relaciones lingüísticas prehistóricas en Sudamérica", in L. Miranda (ed.), Actas del I Congreso de Lenguas Indígenas de Sudamérica, Tome I, Lima, Universidad Ricardo Palma, Facultad de lenguas modernas, p. 95-104.
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