present
present stem + theme vowel + personal ending
imperfect
present stem + theme vowel 2 + ba + personal ending
1+2 future
present stem + theme vowel + bi + personal ending
3 + 4 future
present stem + theme vowel 2 + personal ending
perfect
perfect active stem + perfect personal ending
pluperfect
pas + imperfect personal ending
future perfect
pas + future personal ending
passive perfect
perfect passive participle + present of sum
passive pluperfect
ppp + imperfect of sum
passive future perfect
ppp + future of sum
imperfect subjunctive
infinitive + personal ending