WOW! I never knew there was an option when using vous. Figured since the vous (subject pronoun) imposed the plural second person it would ALSO impose the plural past participle. Is it grammatically wrong to use 'retournes' in this case... even though you are only using the vous form for politeness. In other words wouldn't you be allowed a pass based on grammar.
Yes, depending on what vous means: second person singular or plural. Just like in English "you" can mean either person or a group of people.
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