Verb conjugation of "derribar" in Spanish

Robert wants to tell us not only about nature and its secrets but also about the ability of the human being to recognize what happens around us. We see only the nice side if we just read and do not analyze.
After placing my luggage there I decided to walk into town and rent a bike. The neighbor of the guest house stopped me on the street and asked me if I was Mike. She told me that she was Luisa.
To be honest, we did not understand one word of what he was saying, because his English was so terrible. Or maybe it wasn't and it was only his accent which we could not grasp. To us it was Chinese.