Verb conjugation of "espumar" in Spanish

We can recognize the facts and how they are. So we might observe a lot of things but we will never understand, we will never know why the flower is red, what brought the little aninal to that height.
I was a little confused because I recognized the voice and I had booked at Luisa's guest house. She explained me that she was sharing the phone with her neighbor and her neighbor was not honest.
Once at the island we climbed up the limestone mountain and got a superb view of the entire bay area. The cave by itself was also impressive and our guide explained about how this cave was discovered.