305 According to Herrero et al. (1971-2:1.126), an allomorph of vowel length verbalization, *T-ya-/, occurs in Omasuyos province of La Paz, but only in certain contexts: on the nominalizer suffix -iri before 13 and 2+3 Future affirmative, but not negative. Glosses for the following were not given, but the verb is yati.cha.fia 'to teach’. *yati.ch.iri.ya.:.wa ~~] 3 F *yati.ch.iri.ya.:ta.wa —~ 23 F The negative forms are the following, with /-:-/ ver- balizer: +. . wo. : jani.w yati.ch.iri.:.ka.:.ti ~ 43 *Sani.w yati.ch.iri.:.ka.:ta.ti ~ 2>3 F Since /-ka-/ incompletive requires a preceding consonant, the negative forms could contain +p e-ya-/ also, reduced to /y/ homophonous with /i:/, that is *jani.w yati.ch.iri.y.ka.:.ti 133 F