Oefeningen:
https://www.englisch-hilfen.de/en/exercises/nouns_articles/apostrophe_s2.htm
https://www.englisch-hilfen.de/en/exercises/nouns_articles/apostrophe_s.htm
https://agendaweb.org/grammar/apostrophe-genitive-case.html
https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-11212.php
http://www.bastrimbos.com/Hotpotatoesfiles/genitive1.htm
https://www.englishexercises.org/makeagame/viewgame.asp?id=2452
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