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Morphophonemic rules account for the phonologically conditioned positional variants of morphemes. They are context sensitive and ordered. The morphophonemic rules of Karbi are presented below.
1) If a morpheme ending a voiceless stop is added to a morpheme beginning with a voiced consonant or a vowel, then the voiceless stop becomes voiced.



dobni   ‘two small boxes’






‘three small boxes’


kitap pak-ni è

kitap pagni

‘two books’

va?et-lo è


‘has come’

varuk-lo è

‘(sub) (Pl.) came’

ap-non è


‘(you) shoot’

ap-ri è

‘dont’t shoot’

This rule is applicable across word boundary also but in this case the voicing is optional.
lek ijir è

leg ijir ~ lek ijir
‘a small  necklace’

lek jirni  è

leg jirni ~ lek jirni
‘two small necklaces’

nuk ichi è

nug ichi ~ nuk ichi
‘one horn’

2) If the final consonant of the preceding morpheme and the first consonant of the following morpheme and the first consonant of the following morpheme are identical, one of the identical consonants is optionally dropped.
vaver-ri è vaverri ~ vaveri
‘don’t come always’
arjap-po è arjappo ~ arjapo
‘will stand’
dam?et-tahay è dam?ettahay ~ dam?etahay
‘may have not gone’

Two rules apply to the following example. First, the voicing rule (Rule 1 ) operates and then the optional dropping rule (Rule 2).
ap-bomlo  è ab-bomlo
‘be shooting’
ab-bomlo è abbomolo ~ abomlo
‘be shooting’
3) When a morpheme beginning with the vowel a is added to a morpheme ending in the vowel e, there occurs a glide y optionally in between the two vowels.

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