Verb conjugation of "double" 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 think it's a good idea to fly to Antigua to a language school. I feel more confident with the grammar in Spanish. Perhaps it would be better if the school would arrange the accommodation.
I live in Cataluna in eastern Spain. I have learned in a language school in Berlin but unfortunately only for a short time. I am a waitress by profession and looking for a new job in my village.