 These 21 short videos will help you quickly see and understand the relationships and patterns between various types of irregular verbs so that you can use them properly. Verbs like swim Number four is verbs like swim. Again, you need to notice the sound shifts. Verbs like swim shift vowel sounds in the past and the past participle, usually from i, to a, and a. Let's look at some examples. Begin, began, begun. Swim, swim, swum. Drink, drink, drunk. Shrink, shrink, shrunk. Stink, stink, stunk. Now some people will say stunk in the past tense. Also we have ring, ring, rung. Sing, sing, sung. Notice again that in these verbs a different sound is used in the past and another sound is used in the past participle. But the consonant sounds remain the same.