If I had know ..... I wish I had know

Last two week, Daeng Baco was in hospital for 3 days. Daeng Toa didn't know this, so he didn't visit Daeng Baco. They met few days ago. Daeng Toa said:

"If I had know you were in hospital, I would have gone to visit you"

Daeng Toa said: "If I had know you were in hospital"
                          means that Daeng Toa doesn't know that Daeng Baco was in hospital.

Can you write another example??