These three columns provide all the information needed to understand irregular verbs. Unfortunately, people often use different names for the three columns, confusing the matter. This is because nearly all irregulars occur in the PAST TENSE and PAST PARTICIPLE. However, irregular verb lists often have just three columns. Traditionally, verbs have four principal parts: present, past, past participle, and present participle. Columns: Understanding Irregular Verbs and Regular Verbs Also, if you teach beginning or struggling writers, check out Pattern Based Writing: Quick & Easy Essay on the homepage. The PDF version includes the Giant Verb List, the Giant Irregular Verb List, a Helping Verbs List, and a Linking Verbs List. This page contains just one section of the FREE 47-page Giant Verb List PDF found here.