... [V]erbs have voice, mood, tense, number, and person. There are regular verbs and irregular verbs; a verb can be linking, transitive, or intransitive, depending on the types of objects or complements it can take; verbs can be auxiliary or main verbs; verbs even stop functioning as verbs and appear as verbal phrases or gerunds. Whew! Covering all that would be way too much grammar for one month. So, here’s a refresher on the basics of verb tense and voice. [excerpt]
Tennielle Fordyce-Ruff, Verbs: The Basics on Tense and Voice, 55(8) Advocate 48 (2012).