What would be the appropriate response to "¿Sabes nadar?" if you do know how to swim?

The appropriate response to "¿Sabes nadar?" which translates to "Do you know how to swim?" is to affirm your ability to swim. By responding with "Sí, sé nadar," you clearly communicate that you do indeed know how to swim. The phrase translates directly to "Yes, I know how to swim," providing a straightforward and confident affirmation of your swimming skills.

This response effectively addresses the question and conveys a positive and confident understanding of the activity in question. Other responses either deny the ability to swim or imply uncertainty, which would not accurately reflect someone who does know how to swim.