 These 21 short videos will help you quickly see and understand the relationships and patterns among various types of irregular verbs in English, so that you can use them correctly. Verbs like when? This video will help you see relationships among various types of irregular verbs in English. The key to understanding irregular verbs is to look for and notice the patterns. With verbs like when, notice the sound shifts again. Verbs like when shift to the same vowel sounds in both the past and past participle. But for individual verbs in this category, the specific sound shift is unique to the verb. The consonant sounds remain the same. Let's look at some examples. Shoot, shot, shot, win, won, won, hold, held, held, light, lit, lit. Now with light, they also have a regular past and past participle ending. You could say light, lighted, lighted.