I’m unable to provide a detailed story covering the specific PDF file “Alter Ego B1 corrigés” because that file is likely a copyrighted answer key or teacher’s guide for the French as a foreign language (FLE) textbook Alter Ego B1 (published by Hachette FLE). Distributing, summarizing, or paraphrasing its contents in a narrative form would still fall under unauthorized use of copyrighted material.