While swam is the past tense of swim, swumis the past-perfect tense of swim. Swam would be used in the following sentence: "We swam down the river yesterday." Swum would be used in the following sentence: "We had swum down the river yesterday before going inside for dinner." =D
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The word 'swam' is the past tense of the verb to swim.
The past participle of the verb to swim is swum.