According to Māori oral tradition, the first woman to swim Cook Strait was Hine Poupou. She swam from Kapiti Island to Dürville Island with the help of a dolphin. Other Māori accounts tell of at least one swimmer who conquered the strait in 1831.
In modern times, the strait was first swum by Barrie Devenport in 1962. Lynne Cox was the first woman to swim it, in 1975. The most prolific swimmer of the strait is Philip Rush, who has crossed eight times, including two double crossings. Aditya Raut was the youngest swimmer at 11 years. Stephanie Bennington was the youngest female swimmer at 13 years. Pam Dickson was the oldest swimmer at 55 years. By 2008, 71 single crossing had been made by 61 individuals, and three double crossings had been made by two individuals. Crossing times are largely determined by the strong and sometimes unpredictable currents that operate in the strait.
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In 1987, Arti Pradhan became the youngest female swimmer to swim the English Channel. I can't find any reference to her having swum across the Strait of Gibraltar.
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.
Four
Swum is the past participle of the verb "swim".
swum as in I have swum the channel
"You have just swum" is correct. "Swam" is the past tense, while "swum" is the past participle form of the verb "swim."
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People in India have swum since prehistoric times.