Bonjour Rene, Here is the part of the lesson that I believe is appropriate: Cases expressing opinions or simple statements (adjectives) about prementioned things, look at these rules: a - c'est for general, unspecific statements and opinions Actually, to me, Paris in the phrase mentioned appears to have been mentioned previously, i.e. Paris?, the question mark in oral or written format tends to indicate the word is being repeated back; hence the use of «c'est» For example: speaker: Have you visited Paris: responder: Paris? Oui, c'est magnifique! -->As far as Didier is concerned: hopefully one does not know too many people named Didier so i would think that is quite specific. --> Ma nouvelle voiture? __ est très confortable. Again there is a question mark like it is being repeated during a conversation, so «c'est» would be appropriate. Again as has been stated many times in various lessons, it is all about the context. Without the complete context, a phrase is difficult to analyze to obtain the exact sense. J'espère que ma réponse vous aiderait. Bonne chance et bonne continuation dans vos études en français, la langue de Molière et qui a été utilisé par le monde français depuis l’époque d’Hugues Capet Ron (a non-native speaker)