Multiple choice Past tense of the word 'swim' is swam swims swum swimmed Reveal answer Fill a bubble to check yourself A Correct answer Explanation The past tense of 'swim' is 'swam'. This is an irregular verb where the vowel changes from 'i' to 'a'. 'Swum' is the past participle form (used with 'have/has'), not the simple past tense.