Group Substitute the vowel in the infinitive for an “a” to get the simple past and for an “u” to get the past participle Begin – began - begun Drink – drank - drunk Ring – rang - rung Sing – sang - sung Sink – sank - sunk Shrink – shrank - shrunk Swim – swam -swum Stink – stank - stunk Run – ran - run Group Substitute the vowel in the infinitive for an “a” to get the simple past and for an “u” to get the past participle Begin – began - begun Drink – drank - drunk Ring – rang - rung Sing – sang - sung Sink – sank - sunk Shrink – shrank - shrunk Swim – swam -swum Stink – stank - stunk Run – ran - run