Which verb tense is correctly used in this sentence? I heard he had swum over two miles in the lap pool the day before.

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The use of past perfect tense in the sentence "I heard he had swum over two miles in the lap pool the day before" is appropriate because it indicates an action that was completed before another action in the past. In this case, the action of "swimming over two miles" occurred prior to the act of "hearing" about it. The past perfect tense is formed by using "had" followed by the past participle of the verb, which in this instance is "swum." This clearly shows the sequence of events and helps to avoid confusion regarding the timing of the actions described. This precise use of verb tense enhances clarity and effectively conveys the relationship between the two past actions.