http://new.aulafacil.com/curso-gratis-de-frances-a1,el-preterito-perfecto,1056,15089
http://new.aulafacil.com/curso-gratis-de-frances-inicial-ejercicios,le-passe-compose-auxiliaire-avoir-ou-etre-et-participes-passes-irreguliers,864,13433
http://www.slideshare.net/fabianafm/pass-compos-pretrito-perfecto
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