The reduplication of roots in Dak as in I E is extremely frequent, in
both, as in other languages, developing iteratives which occasionally
become intensives. The reduplication of Dak words is like Skt of but one
syllable, usually but not always the root.
The suffix a, aya, which formed verb stems of I E roots usually becomes
a, e, i in Dak as in old Eu. languages.
Ya seems to be rarely preserved: I E pak cook, Skt papakaya parch; Dak
papakhya parch; I E agh say, Lat ajo for aghya say; Dak eya say. The Dak
has many relics of the n of suffix na, which worked its way before the
final consonant; I E tag touch whence I E tang, Lat tango; Dak tan
touch. There seem to be relics of the other methods, which were however
so closely akin to methods of forming nominal stems that they need not
be discussed here.
Schleicher gives two methods of forming secondary verb stems: by suffix
sa forming frequentatives; by suffix ya cause to be, forming transitive
verbs from verbs, adjectives and nouns. Both are living suffixes
extremely frequent and having the same force in Dak.