This document defines verbs and their types and forms. It states that a verb is a word that describes an action, state or occurrence. Verbs have three forms - present, past and future. There are three types of verbs: intransitive verbs whose action does not pass to an object, transitive verbs which must be followed by an object, and linking verbs which connect the subject to a description rather than an action. Regular verbs form their past tense by adding -ed or -d, while irregular verbs change their spelling or both vowel and consonant. The verb must agree with its subject in number and person.