http://www.quia.com/rr/976021.html --> Le négatif
http://atschool.eduweb.co.uk/rgshiwyc/school/curric/French/Year8Revision/Yr8_Begin_Perfect_Tense/index.htm
<--A bunch of exercises
http://www.tapis.com.au/studentbook2/Unit4/u04_maniere_a01.html <--Matching images