POSSESSIVE´S GENITIVE

http://www.agendaweb.org/grammar/apostrophe-genitive-case.html

http://www.agendaweb.org/grammar/apostrophe-genitive-case.html

http://www.englisch-hilfen.de/en/exercises/nouns_articles/apostrophe_s4.htm

http://www.englisch-hilfen.de/en/exercises/nouns_articles/apostrophe_s2.htm

POSSESSIVE ADJECTIVES

http://www.eslgamesplus.com/possessive-adjectives-game/

http://www.agendaweb.org/grammar/possessive-exercises.html

http://www.agendaweb.org/grammar/possessive-adjectives-exercises.html