http://edtech.tph.wku.edu/~nlove/101-102/interact101-102/r-p_u02_possess_adj.htm
http://edtech.tph.wku.edu/~nlove/101-102/interact101-102/r-p_u02_possess_adj2.htm
http://franz.asn-graz.ac.at/franzoesisch1/exercices/ex02-poss_sing.htm