|Papua New Guinea|
|Linguistic classification:||perhaps Left May – Kwomtari or Kwomtari–Fas|
Despite the fact that the family consists of just two closely related languages, Baibai and Fas (40% cognate), there has been considerable confusion over its membership, apparently due to a misalignment in the publication (Loving & Bass 1964) of the data used for the initial classification. (See Baron 1983.) The initial name of the family was Fas, but Laycock (1975) changed it to Baibai when he mistakenly moved the Fas language to the Kwomtari family, an error perpetuated in much of the literature. Baibai (Baibai and Biaka) is therefore not a synonym for the Fas family (Baibai and Fas). See Kwomtari–Fas languages for details.
A few regular sound correspondences are apparent (Baron 1983:21 ff):
|correspondence||Fas example||Baibai example||Gloss|
|*ɾ → k, ɾ||kəmas||ɾəmas||"bow"|
|*k → zero, *k||kɛj||ɾɛɡi||"hand" (‹ *ɾɛki)|
*/k/–/f/ metathesis still operates in Fas. /s/–/f/ and /s/–/m/ metathesis has been reconstructed.
*/k/ is lost in some environments. Baibai [ɾɛɡi] may be phonemically /ɾɛki/.
Baron sees no evidence that the similarities between the Fas and Kwomtari families are any greater than with neighboring unrelated families, and thus doubts the validity of the putative Kwomtari–Fas family.
Two papers were published by Wietze Baron (1979, 1983a) on the phonology of Fas. Baron argued that the phonological processes of Fas contradict claims by proponents of Natural Generative Phonology that Paul Kiparsky's Opacity Principle allowed no exceptions. See Optimality theory for later developments in phonological theory. Further papers are posted on his website. Recently an honours thesis by Fiona Blake (University of Sydney) has also been posted on the web; she refers to Fas as Momu.
The Fas language apparently has a seven-vowel system. It also has a bilabial trill [ʙ] (Baron 1979:95), even though Laycock (1975:854) had expressed his doubts about earlier reports of this feature by Capell (1962).
- Baron, Wietze (1979). "Light from the dark ages of Chomsky and Halle's 'Abstract phonology'". Kivung 12: 89–96. OCLC 9188672.
- Baron, Wietze (1983a). "Cases of counter-feeding in Fas". Language and Linguistics in Melanesia (formerly Kivung) 14: 138–149. OCLC 9188672.
- Baron, Wietze (1983b). Kwomtari survey., posted at: 
- Blake, Fiona. 2007. 'Spatial reference in Momu'. Posted at 
- Laycock, Donald C. (1975). "Sko, Kwomtari, and Left May (Arai) phyla". In Stephen A. Wurm. Papuan languages and the New Guinea linguistic scene: New Guinea area languages and language study 1. Canberra: Dept. of Linguistics, Research School of Pacific Studies, Australian National University. pp. 849–858. OCLC 37096514.
- Loving, Richard; Jack Bass (1964). Languages of the Amanab sub-district. Port Moresby: Department of Information and Extension Services. OCLC 17101737.
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