The same as root athematic imperfective verbs. The present optative takes the suffix "-e" and athematic secondary endings. Athematic verbs, and perfect actives and aorist passives, add the suffix instead, e.g., . Also called "simple athematic", this formation derived imperfective verbs directly from a root. The subjunctive of athematic verbs was thus thematic, and morphologically indistinguishable from a thematic indicative. The root aorist is characteristic of athematic verbs (those with a present active in ). See Athematic accent/ablaut classes of PIE nouns for examples. This classification is relevant for inflecting the athematic nominals of different accent/ablaut classes. Verbs, like nominals, made a basic distinction between thematic and athematic conjugations. This aorist is formed by directly adding the athematic secondary endings to the root. The infix itself ablauts like root athematic verbs. Marked contrasts between thematic and athematic verbs appear in Lithuanian, and Old Church Slavonic. Its endings are characterized by ("oi") in thematic verbs and in athematic verbs. Sanskrit has ten classes of verbs divided into two broad groups&colon; athematic and thematic. The stem of athematic nominals ends in a consonant.