С! нужно поставить предложение : he swims a lot . в : present simple past simple future simple present perfect present continuos.

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.