LA NÉGATION

http://www.catherine-meissner.org/negation.htm
http://www.lepointdufle.net/negation.htm
http://robergonzalezdecuenca.blogspot.com/2008/05/exercices-de-la-ngation.html
http://www3.humnet.unipi.it/francese/Lecon6/Lecon_6c.htm