When do you use "Comment allez-vous ?" vs "Comment ça va ?"

You have to be formal, polite, respectful with the person you are talking with : Comment allez vous ? You are talking to several people : Comment allez-vous ? You know very well the person you are talking with : Comment ça va ? -> Ca va ? Comment vas-tu ? The video in spanish : https://pollylingu.al/fr/es/videos/4591

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