This document discusses verbs and their classification. It defines main verbs and auxiliary verbs. Main verbs can stand alone in a clause, while auxiliary verbs precede main verbs. Verbs are also classified as activity verbs or state verbs based on whether they can occur in the progressive aspect. Other classifications of verbs discussed include transitive verbs, which take direct objects, intransitive verbs, which do not take direct objects, and linking verbs, which are followed by subject complements. Various activities are presented to identify verbs and classify them based on inflections, derivational affixes, and syntactic function.