Verb conjugation of "erschüttern" in German

Hans was not in the office for 4 days. I informed him that it is urgent and asked him to send it by tomorrow morning. I'll do my best that you receive it as early as possible. Trust me on that.
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.
On our last day we went to visit Stanley, a small town on Honk Kong island, actually on the other side of the mountain. The ride to the town was nice but the town itself was nothing special.