I assume your question is if this sentence is correct. It's not. :(
Correct: He swam across the lake yesterday.
Example of "had swum":
"Before the day of the race, I had swum two miles every day."
"Had swum" (or "had done anything") shows the action happened before a past action or event.
"Swum" is the past participle of "swim" (I swim today, I swam yesterday, I have swum there before). I couldn't believe he had swum the English Channel at such a young age.
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
The correct usage of the word swim in past tense is swam. They swam in the pool yesterday.
I have no idea who Sam Fellows is but I know no one has swum across the Pacific.
The past tense of "swim" is "swam," while the past participle is "swum." The past tense is used to describe an action that occurred in the past, while the past participle is often used with auxiliary verbs to form perfect tenses, such as "have swum." For example, you might say, "I swam yesterday," or "I have swum in the ocean."
swum
Yes, several individuals have successfully swum across Lake Superior, which is the largest freshwater lake by surface area in the world. Notably, in 2015, a swimmer named Chad T. held the record for the fastest swim across the lake, completing the 21-mile journey in about 10 hours. The swim presents significant challenges due to cold water temperatures, strong currents, and variable weather conditions. However, it remains a remarkable achievement for endurance swimmers.
The crocodile swam across the swamp; it saw a fish.
will have swum
It must be used after some form of have. He/she/it (has) swum. We/You/they (have) swum. Or having, as in: Having swum the length of the pool....
swum as in I have swum the channel
will have swum is the verb phrase.