102 3 Phonologyimperfectives, and so forth, regardless of the shape of the rest of the stem. A
stem-final V likewise has characteristic alternations, sensitive to the
unaugmented/augmented split but for the most part not sensitive to the shape
of the preceding stem. For the augmented V-final verbs, a lexical distinction
between i and u is necessary. A medial full V, lexically either i or u, again has
its own set of alternations. Verbs with two full V's, say medial and final (with
augment), simply combine the local characteristics of full-V-medial and
augmented V-final verbs.
3.4.1.4 Light and heavy (middleweight and superheavy) verb stems
However, in addition to the typology based on location of full V's (if any),
there is also a split between light and heavy stems. The productive VblN of
heavy stems (in T-ka) is characterized by Sg vocalic prefix a- and stem-wide
which has default accent), e.g. a-diirhan 'desiring' from -durhvn- and a-brsffi
'collapsing' from (augmented) -bvrvffi- (+ -t). By contrast, the light stems
have a range of shape-specific VblN's, none of which closely resembles the
heavy VblN type. The heavy/light distinction is presented in more detail in
(79).
(79) Heavy and Light Verb Stems
C-final V-fmala. heavy
i. middleweight subtype
-CvCvC-
-CuCvC-
-CvCCvC-
-CuCCvC--CvCu- (+ -t)
-CuCi>, -CuCu- (+ -t)
-CvCCi>, -CvCCu- (+ -t)
-CDCCD-, -CUCCD- (+ -t)ii. superheavy subtype
-CvCuCvC- -CvCuCu- (+ -t)
-CvCuCCvC- -CVCUCCU- (+ -t)b. light
-vCCvC-
-uCCvC-
-vCvC-
-uCvC--vCCiv
-uCCu-
-vCu-
-DCU-