What is a Verb? A verb is the "action" or "being" part of the predicate of a sentence. The different forms of a verb are called tenses and express present, past, and future times. The principal parts of a verb are: the infinitive, the present participle, the past tense, and the past participle. Regular verbs form their past tenses by adding -d or -ed to the infinitive. Irregular verbs form their past tenses in a different way. Read More...