Durative or continuous action similar to the `progressive' construction verb+ing in English, developed from the combining of kol in its LT AVP form koNDu with the `stative' aspectual verb iru , i.e. koNDiru, (in ST kiTTiru ) which is affixed to the AVP of a main verb: vandu + kiTTirundeen `I was com-ing.' In modern ST, kiTTiru ought to be taken as a separately grammaticalized semantic unit, i.e. koL has been recruited here, fused with iru and results in something different from the other avatars of koL. Explaining how the meanings of koL and iru are combined to express duration will be done below, i.e. which elements of these lexical verbs have metonymically been extended and recruited in the grammaticalization of kiTTiru is a story in itself. In ST radical phonological changes have resulted in koNDiru being realized as kiTTiru in non-Brahman dialect, and -NDiru in Brahman dialect. Also, kiTTiru, because of its grammaticalization as the marker of duration, may lose its initial k- and occur just as -iTTiru
This lenition and deletion of initial v- and k- I have dealt with in my 1993 article ``Intervocalic V-deletion in Tamil: Its Domains and its Constraints." Journal of the American Oriental Society 113(4)513-528.
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