French language Q&A Forum

I thought the following analysis by Google's Gemini was interesting.  

Le mot correct est "siècle".

Explication :

Voici quelques arguments supplémentaires pour justifier le choix du mot "siècle" :

Conclusion :

Le mot "siècle" est le choix correct dans cette phrase. Il est plus précis, plus élégant et plus cohérent avec le contexte que le mot "siècles".

I know it must be my ear, but, having listened to it over and over, it seems the speaker says "mais cera n'est pas obligatoire."  

What is the difference between ça et cela ?

Je n'entends pas ont dans le phrase, Mes amis ont honte de leur comportement. 

I don’t think the "grand" in the final sentence sounded quite right, more like gros. It was fine in the recording of the whole extract but not in the individual exercise. Or is it my ears?! (Une nouvelle que nous avions accueillie avec grand soulagement !) 

Il doit être le coup d'œil, non?

I believe "avant que" takes the subjunctive.  Since this is a memory from the past, shouldn't we use the past subjunctive?

As I know we use "en" to replace a noun that follows number/quantity such as un(e), deux, un peu de etc.. so in this case it means that I can use "en" to replace ANY noun including "idée, histoire, conseil, chance" etc but only with any indefinite article, right? And in examples like "je vais vous donner une idee" "il raconte une histoire à mon ami" these nouns can be also replaced with "en", right? or not? why? I passed several tests where these nouns were replaced with COD(le,la,les) and I really can't understand why.. can someone explain it to me, please?

Please can some explain why the subjunctive mood is used in the sentence - Qu'est-ce que tu dirais qu'on se fasse une double séance en son honneur?