no one has actually swam around but people have been on rowing boats and canoes around and have swam the channel
No one has ever swam across te longest river
Yes, it is.
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.
swum as in I have swum the channel
Swum is the past participle of the verb "swim".
"You have just swum" is correct. "Swam" is the past tense, while "swum" is the past participle form of the verb "swim."
infinitive: swimpast: swampast participle: swum
The present perfect is created with has/have + a past participle.I have swumWe have swumYou have swumHe/she has swumThey have swum
"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.