The semi-participle is an infinite verb form derived from participles in East Baltic languages. It expresses a secondary process, the main process is realized by the finite verb, where the agent of the semi-participle is identical to the subject of the main verb (as in the Slavic transgressive ). The secondary process is always simultaneous in relation to the main process (otherwise an active participle must be used in the nominative). Although the half participle is active in itself , it probably developed from the passive present participles auf -am (with a d -proposal), cf. Lithuanian neš am as (PP) vs. neš dam as (half participle).