He swims a lot (usually, he likes to swim) это и есть Present Simple. He swam a lot (last summer) Past Simple. He will swim a lot (next summer) Future Simple. He has swum a lot (this year, he is in good physical shape) Present Perfect. He is swimming a lot (during these months, he wants to win the swimming competition) Present Continuos.
He swam a lot (last summer) Past Simple.
He will swim a lot (next summer) Future Simple.
He has swum a lot (this year, he is in good physical shape) Present Perfect.
He is swimming a lot (during these months, he wants to win the swimming competition) Present Continuos.