1. The collapse of Classes I–III into one class: (a) in Russian and
Belarusian by the prepalatalization of consonants before e; and (b) in
Bulgarian and Macedonian through the merging of e and je into e.
2. The development of a new class of -a- verbs in West and South Slavic
(which we shall call Class VI), through the contraction of aje to a
(Rus de
´
lae
ˇ
s
0
,Czd
ˇ
ela
´
ˇ
s ‘you [Sg] do’).
3. Lower Sorbian has a unique new paradigm with the theme j, derived
mainly from roots in j: stojas
´
‘to stand’, stojm ‘I stand’, stoj
ˇ
s ‘you [Sg]
stand’. We shall call this Class VII.
4. Diversification of inflexions through stress alternations, especially in
Russian and Belarusian, resulting in differences of vowel quality: ‘I take’:
Rus beru
´
[b
j
I¨ru], Bel bjaru
´
0
; ‘you [Sg] take’: Rus ber
¨
e
ˇ
s
0
, Bel bjare
`
ˇ
s.
We shall continue to use these class names (I–V, plus VI–VII) for the modern
languages.
The modern languages therefore show (excluding athematic verbs):
a. two paradigms (I þ II þ III (e), and IV (i) ): Rus, Bel, Ukr
b. three paradigms (I þ II þ III (e), IV (i), VI (a) ): Blg, Mac, B/C/S, Sln,
Cz, Slk, USorb, Pol
c. four paradigms (I þ II þ III (e), IV (i), VI (a), VII (j) ): LSorb
(e thus now includes ne (II) and je (III) in all languages; the traditional description
in some languages may distinguish one or both of these, but the range of possibi-
lities is essentially the same across the whole group).
Stem The stem can undergo morphophonological alternations in different parts
of the verb, and, in order to predict the correct forms of even regular verbs, one
must know four forms: the infinitive, 1 Person singular present, 2 Person singular
present, and past passive participle (e.g. Rus pe
ˇ
c
0
‘to bake’, peku
´
, pe
ˇ
c
¨
e
ˇ
s
0
, pe
ˇ
c
¨
ennyj).
In this example the palatalization apparently shows two major stems for the same
Table 5.26. Proto-Slavic conjugational classes
Class Theme PSl examples (stems)
I -e- nes- ‘carry’, mog- ‘be able’
II -ne- dvig- ‘move’, gib- ‘bend’
III -je- a. stem in vowel: zna- ‘know’, my- ‘wash’
b. stem in consonant: pis- ‘write’, plak- ‘cry’
IV -i- pros- ‘ask’, vid- ‘see’, le ˇz- ‘lie’ (< earlier *leg-)
V -ø- (‘‘athematic’’) ( j)es- ‘be’, da(d )- ‘give’
282 5. Morphology: inflexion