The derivation of Latin "sum,""es(s),""est" from Indo-European "esmi,""est,""esti" involves methodological problems. It is claimed here that the development of "sum" from "esmi" is related to the origin of the variation "est-st" (less than"esti"). The study is primarily concerned with this process, but chronological suggestions are also made. (CHK)

An introduction to the Russian phonemic system leads to a model classification of verb forms derived from the infinitive and present stems of selected verbs. Correspondences between the two sets of verb forms are listed. A brief history of attempts at verb classification concentrates on the theory of Meyer, Berneker, and Bloomfield. A complete…

Research on which portions of this study are based was performed under a National Science Foundation Grant and a grant from the National Endowment for the Humanities. (VM)