Here is the sentence:

Danny loved going to the beach. He watched beautiful women in skimpy bikinis, ate fresh seafood, and swum in the refreshing water. After a shark bit his leg, however, Danny preferred the pool at his apartment complex.

The second verb, swum, is incorrect. As you know, the sentence requires the simple past form, swam, because there are no auxiliary verbs.

Swim is an irregular verb; the chart below shows its forms.

Verb Simple Present Simple Past Past Participle
swim swim(s) swam swum

Go to the next sentence, champ!

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