French language Q&A Forum

Why is there so much emphasis on this when it’s only used in serious written French.

I keep getting marked incorrect in my A0 quiz when asked to fill in the blank. Every time I will use one of these and it will say I should use the opposite. I don't understand why/when to use one variant over the other, especially when there is no indication of formality in the question. At this point I feel like I'm taking the quiz over and over due to this one mistake and just switching between the two but always incorrect.

Take "le Sacré Coeur" as an example, which variant should I use and why?

Qu'est-ce que c'est le Sacré Coeur?
Qu'est-ce que le Sacré Coeur?

Why do i not use l'imperfait in this sentence. Its a habit? So i use the imperfait?

Just wanted to check if this is a mistake. I found this on Duolingo.

Nous ne nous sommes plus jamais parlé.

Why is the verb parlé not agreed with the reflexive pronoun?

Merci très beaucoup.

Hello,

Is there is a reason why some words require a 'consolidated' partitive with the definite article (du / de la) and some only require the 'unconsolidated' partitive (de)? Such as "je bois du vin' vs. nous buvons 2 litres d'eau par jour'?

I am trying to come up with a little rule to make things easier to learn / remember, but it doesn't seem that it works like that.

Thanks,

Alex

Qu'est-ce que le "en" remplace dans cette expression? "je n'en croyais pas mes yeux"