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Declensions disappeared from French during the XIVth century. It's one of the defining elements of the transition between Old and Middle French.
In some places the sujet case has survived and there are doublets (gars/garçon, pute/putain, copain/compagnon, sire/seigneur etc.)
http://monsu.desiderio.free.fr/curiosites/cassujet.html
http://en.wikipedia.org/wiki/Old_French#Grammar
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