Verb conjugation of "perturb" in English

Work was performed only in June, July, August and September. In October and November, Erik has been waiting for Katja's visit and Sabine was on maternal leave after Christmas and New Year.
I have three children, Michelle, Cathy and Joe. Unfortunately, my parents do not live in the area. I am glad that they visit every 2 weeks, although they are already over 70 years old.
It's very good for me to be a member at Vocabulix be because I meet many new people. I'm currently being trained to be travel consultant and I really need English and Spanish and maybe other languages.