Proto-Tḷantali language

A-mutation
Low vowels /æ æː ɑ ɑː/ are causing a vowel mutation, in which high vowels /i iː ɯ ɯː u uː/ are lowering to middle counterparts /e̞ e̞ː ɤ̞ ɤ̞ː o̞ o̞ː/ before syllable containing low vowels.

Phonotactics
(C)V(ː)(C)

C = any consonant V = any short vowel Vː = any long vowel

Accent
First syllable for singular number, last syllable for plural. Words may have only one stress. Monosyllabic words are unstressed, but pronouns have two variants: monosyllabic singular pronouns are unstressed, but the same forms in plural are stressed for distinction.

Noun
Morphemic order: Class + (Root + Number) + Root extensions + Definiteness + Possession

Verb
Morphemic order: [Subject] + [Modal particle] + [Modal verb] + [Root + Circumstantiality + Aspect] + [Object]

Circumstantiality
Circumstantials are promoting object of a transitive or ditransitive clause into position of subject.

Word order
Word order is SVO, and is not free. Subject of a clause is always first before an object. Reversing of order of subject and object means replacing the theta roles between those.

Copular verb
Copular roots are combined with evidentiality.