Verb conjugation of "erstaunen" in German

I expect it towards the weekend. Will you by any chance be in Switzerland in the week from June 15 to June 19? Most importantly, I will ask you to send me your homework so that I can correct it.
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.
There were heaps of people in this area and we really had to struggle to get through the crowds. We drank a few beers and a couple glasses of wine and being totally tipsy Lili decided she needed to return.