This volume focuses exclusively on the behavior of prefixed perfectives (NP) in Russian that share the same lexical meaning as the corresponding imperfective simple verbs. The main objective of this book is to show how Russian verbal prefixes express meaning even when they are used to form the perfective partners of aspectual pairs. The book highlights recent breakthroughs in research on Russian aspect, namely a new hypothesis that “the Russian verbal prefixes function as verb classifiers, parallel to numeral classifiers” (xi).