Fill in the Blanks Regular and Irregular Past Tense Verbs Fill in the BlanksOnline version Test your knowledge of regular and irregular past tense verbs by filling in the blanks with the correct forms. by Vanessa Ballinger 1 Regular and irregular past tense verbs English grammar Regular verbs are an essential part of . form their past tense by adding - ed to the base form , while irregular verbs have unique past tense forms that do not follow a specific pattern . It is important to memorize the past tense forms of both regular and irregular verbs to communicate effectively in English .