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The New Pali Course Part III (1950)
Prof. A. P. Buddhadatta Maha Nayaka Thera
Chapter II Denominative Verbs
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The conjugational signs of these are sa, cha, and kha. The first syllable of the root is reduplicated before these signs.
In reduplication:
(a) An aspirate must be reduplicated by its unaspirate: bhuja becomes bubhuja.
(b) A guttaral is reduplicated by its corresponding palatal: ghasa becomes jaghasa.
(c) Initial h is reduplicated by j: haa becomes jahaa.
(d) A long vowel in a reduplicated syllable is shortened, as in the above jahaa.
Suffix Sa
(1) su (to hear) + sa becomes susu + sa when it is reduplicated.
* su + su + sa + ti becomes sussuusati when the second s is doubled and u is lengthened. Sussuusati, desires to hear
(2) ji (to conquer) before sa is changed to jin; it becomes jijin when the first portion is doubled; again it becomes jigi.m when j is changed to g. Its parallel form is jigiisati.
* jigi.m + sa + ti = jigi.msati, desires to gain or to pursue
(3) paa (to drink) is changed to pivaa (through pipaa).
* pivaa + sa + ti = pivaasati, desires to drink
(4) manA (to think) before sa is changed to viima.m (through miima.m). vii + ma.m + sa + ti = viima.msati, investigates.
ref:
http://www.tipitaka.net/pali/synthesis/pali3.00.cdv
(to be continued...)