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1st person stem for sum
Sum
1st imperfect stem sum
Era
1st perfect stem sum
Fui
present stem possum
Poss(u) Pot(e)
1st imperfect stem possum
Potui
Perfect stem possum
Poter
present stem volo
Volo
Perfect stem volo
Volu
Imperfect stem volo
Vole
Present endings volo
o,s,t,mus,tis,nt
Imperfect
(b)am,(b)as,(b)at,(b) amus,(b)atis,(b)ant
Perfect
i,isti,it,imus,isitis,erunt
Present everything else
um,es,est,mus,(ist)is,sunt/erunt