Aiton language

The Aiton language or Tai Aiton language is spoken in Assam, India (in the Dhonsiri Valley and the south bank of the Brahmaputra). It is currently classified as a "threatened" language, with less than two thousand speakers worldwide. Its other names include Antonia and Sham Doaniya.
Classification.
The Aiton language is a part of the Southwestern branch of the Tai family of languages. There are three other actively spoken languages in this branch: Khamti, Phake, and Khamyang.
History.
The Tai languages in Assam share many grammatical similarities, a writing system, and much of their vocabulary. The most prominent differences between the languages are their tonal systems.
According to the oral and written records of the Aiton people, they originated from a place named Khao-Khao Mao-Lung, a Burmese state near the Chinese border. It is generally believed that they came to India about two or three hundred years ago, seeking refuge from oppression. Despite how long they have been in Assam, many members of the older generations are not fluent in Assamese, the official language of the state.
Geographic Distribution.
Aiton is spoken predominantly in India, in the northeastern state of Assam.
According to Morey (2005), Aiton is spoken in the following villages:
Buragohain (1998) reports a total of 260 Aiton households, comprising a total population of 2,155.
Phonology.
Initial consonants.
Morey reports the following initial consonants:
Aiton, like some other Tai languages, have a "minimal three-way contrast in voicing". It also only allows vowels to be voiced stops when they are in bilabial and dental/alveolar places of articulation. According to Morey, " and are variants for and , respectively". Aiton, has voiced and four voiced nasals in its sound inventory. It does not have voiceless sonorants.
Final consonants.
Aiton has the following final consonants:
-[w] occurs after front vowels and [a]-, -[j] occurs after back vowels and [a]-.
Tones.
Aiton today uses three tones, however it originally used five but two have merged with other tones. The first tone still used today is 'mid/high level', the second tone is 'high level then falling' and the third is 'mid falling'. Originally the fourth tone, 'mid rising', has merged with the first tone. The fifth tone, 'mid falling glottalised', has merged with the third tone. 
Vowels.
Aiton has a vowel system of only seven vowels, , which is the smallest out of the all the Tai languages spoken in Assam. From these seven vowels, Aiton allows only nine possible sequences.
Grammar.
Pronouns.
The following set of pronouns are the pronouns found in the Aiton language:
Demonstratives.
Note: the form /-an2/ is a post-clitic form that approaches a definite article in function and may be attached to pronouns and even verbs.
Classifiers.
The most common classifiers are kɔ1 for persons, tu1/to1 for animals and ʔan for inanimate objects.
Writing system.
The Tai Aiton have their own writing system called 'Lik-Tai', which they share with the Khamti people and Tai Phake people.It closely resembles the Northern Shan alphabet of Myanmar, which is a variant of the Burmese script, with some of the letters taking divergent shapes.