Proto-Nambāno language

Consonants
The unlabialised dorsal consonants *ŋ *g *k *h may have had some degree of palatalisation.

Transitive Verbs
Transitive verbs had three conjugation paradigms, perfective, imperfective and irrealis, each with a different form of the verb stem.

The three forms of the stem are distinguished as follows: Some examples of vowel-final and consonant-final transitive verb stems are shown below.
 * Perfective stem
 * -∅ on consonant-final roots, *-h on vowel-final roots (note realisation as *-hʷ before the 2sg, 2pl and 3pl suffixes *-ɒkʷu, *-op and *-ok)
 * Imperfective stem
 * Mutation of final obstruents:
 * p *t *s *k *kʷ > *hʷ *h *h *h *hʷ
 * b *d *z *g *gʷ > *p *t *s *k *kʷ
 * Fronting ablaut of final vowel in stem:
 * {*-i-, *-ɨ-, *-u-} > *-i-
 * {*-e-, *-ə-, *-o-} > *-e-
 * {*-æ-, *-ɒ-} > *-æ-
 * Irrealis stem
 * -əN on consonant-final roots, *-N on vowel-final roots, where N assimilates to the place of articulation of the following consonant in the suffix of the irrealis conjugation (*-tæ, *-co *-dæu, *-ktæ).

The suffixes are shown below.

The imperfective suffixes appear to be descended from PAQ infinitive series {*-kʰi, *-kiː, *-kʰiːkʰ, *ʡiː} with an unknown suffix *-r and irregular infixing on the second person suffix *-ciː⟨r⟩k. This unusual development represents the only finite verb forms developed from the PAQ infinitives present in the Arklobu-Qachkav family.

The irrealis suffixes are the reflexes of the reconstructed suffixes of the PAQ conditional series, reflecting only the singular person forms and dropping the plurals. { *-(ə)ntʰx₂əʡ, *-(ə)ncʰʊːʡ, *-(ə)ntx₂əʡʊ , *-(ə)ntx₂əjʊ, *-(ə)nqtx₂ə , *-(ə)nqtx₃əʡ}.