Verb conjugation of "clip" 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.
My correction were added and highlighted with yellow markers and attached to this email. Tell me now if you have any questions about grammar rules, since I was a teacher 10 years ago.
These are very good images, please send me more... I think Oslo is a very calm city. Every day it is getting more international and culturally richer. I work as a general secretary in a law firm.