Verb conjugation of "abtreiben" in German

From time to time I listen to my old CD collection. However, most of the CD boxes, meaning the covers, are so full of dust that one can hardly see the image. Taste changes with the age, that is known.
Joanna started kindergarten 2 weeks ago. She got used to it very quickly and I must say that I am very pround of her. She is now 23 months old and we are going to celebrate her birthday in three weeks.
Fortunately the bay we anchored was very calm and the ship did not move at all, or at least one could not feel it. We prepared for dinner and went to the deck, where everybody else was sitting.