Note 22 — INTRODUCTION
Reading edition
The occurrence of the tense affixation is predictable: a verb form which occurs with a given voice-mode affix in one tense occurs also in the same voice and mode in the other tenses. The voice, mode, and aspect affixes, however, are not predictable. Some verbs occur in one, some in two, some in three, some in all four voices; some occur only in the potential mode, some with only durative active affixes, and so forth.