I have singled out a few verbs for review here because their patterns of conjugation are either irregular or difficult.
(1) Ndúpuw vai he cooks
Difficulty: hidden vowel (ă) and shift in consonant from (d) to (t)
Nátpwi
Kŭnátpwi
Ndúpuw
Nàtpwíhna
Kŭnàtpwíhna
Kŭnatpwíhmwa
Ndúpŭwak
Explanation:
(nu) + (ndupwii) = nátpwi
The prefix (nu) puts stress on the deleted vowel between (n) and (d)
This vowel turns out to be (a)
The cluster (nd) expands to (nat)
(2) Uw vai he says
Difficulty: irregular beginning pattern and monosyllabic vowel unstable stem (ii)
Nzi, nziim
Ksi, ksiim
Uw
Nzíhna
Ksíhna
Ksíhmwa
Úwak
Mah nzíiwu
Mah ksíiwu
Mah íiwu
Mah nziiwíhna
Mah ksiiwíhna
Mah ksiiwíhmwa
Mah iiwíiwak
(3) Eew vai he goes
Difficulty: monosyllabic stem (ee)
Nda, ndaam
Kta, ktaam
Eew
Ndáhna
Ktáhna
Ktáhmwa
Éewak
Mah ndáawu
Mah ktáawu
Mah éewu
etc
With preverb aalu- unable to
ndáalu-a
ktáalu-a
áalu-eew
etc
(4) Wum vai he comes from + location
Difficulty: irregular beginning pattern and monosyllabic stem, weak syllable deletion (wu-)
Noom
Koom
Wum
Noomóhna
Koomóhna
Koomóhmwa
Mook
(wu) deletes in word initial position before syllable starting with (m)
Mah noomóowi.
Mah koomóowi.
Mah móowi.
Mah noomoowíhna.
Mah koomoowíhna.
Mah koomoowíhmwa.
Mah moowíiwak.
With preverb kata
nágta-wum
etc
(5) Peew he comes
Difficulty: monosyllabic unstable stem (paa)
Mba, mbaam
Kpa, kpaam
Peew
Mbáhna
Kpáhna
Kpáhmwa
Péewak
(6) pumúsuw vai he walks
Difficulty: stress assignment, deletion weak syllables
Mbúmsi, mbúmsiim
Kpúmsi, kpúmsiim
Pumúsuw
Mbumsíhna
Kpumsíhna
Kpumsíhmwa
Pumúsŭwak
With preverb kata-
ngata-pumúsi or ngata-pumúsiim
kata-pumúsi
etc
(7) Liitéeheew vai he thinks
Irregular: drops initial (l) before prefixes:
ndiitéeha
ktiitéeha
liitéeheew
ndiiteeháhna
ktiiteeháhna
ktiiteeháhmwa
liiteehéewak
With preverb noochu- begin to do s.t.
Noochu-liiteeha
Kunoochu-liiteeha
etc
(8) txíi-kătum vai be so many years old
This verb inserts (und) after prefixes.
Wiimbat ndund-txii-katum.
I am ten years old.
Kéexu ktund-txíi-kătum?
How old are you?
Kéexu néeka txíi-kătum?
How old is he?
(3rd sg and pl VAI do not use (wu) prefix)