Past particlbe

The past particible for swim:

Swim, swam and (have or has) __________?

I have gotten different answers ffrom my parents. One says swam, the other say swum.

Can you help??

Thanks,

Jacob
Age 8 - grade 3

I swam there yesterday. I have swum there many times. In fact, I must have swum there a hundred times. Lisa has swum there too. We have both swum there. We enjoy swimming there.

:)