Аннотация:Author in the article treats the opposition of Lithuanian and Slavic cognate verbs with the full and zero grade of root vocalism, investigated by Grigory K. Ulyanov and Philipp Th. Fortunatov. The full grade verbs are transitive, they denote the actions what subject can control. The verbs with zero grade denote the uncontrolled by the subject processes and/ or states, caused by ac-tions, expressed by full grade verbs. Author argues that the meaning of intransitivity, anticausa-tivity is one of meanings occurred by the shift accent on the right, on the end of word form. The actuality of the papers is caused by a great role of the simultaneous reconstruction in several lev-els of language (accentuation, ablaut, morphosemantics); its novelty consists in the regular apo-phonic approach to the verbal morphology and meaning of verbal stem.