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Grammar geek alert!
"Swam" is the preterite form of the infinitive verb "to swim." It is used to describe a one-time, completed action.
Ex: Yesterday afternoon I swam in a lake.
"Swum" is the participle form of "to swim." Participles are used with auxiliary (aka "helping") verbs.
Ex: I have swum in lakes before.
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History doesn't repeat itself, but it often rhymes.
Mark Twain
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