French language Q&A Forum

Is this type of sentence structure formal? I am having difficulty in knowing which is formal and which is informal. When will a sentence like this be used? 

I would greatly appreciate if there was some sort of guide for this. Thanks!

If you were to say something such as "after eating, I will go for a walk," are you required to use the anterior future and repeat "je" twice, or is it somehow possible to incorporate an infinitive like this (Être allé manger, perhaps?).

I'm curious about the liaison in œufs en chocolat. I think I heard the F linked. I would likely have linked the S instead. Could you explain this please?

So do "Qu'est-ce que fais tu?", "Fais tu quoi?" and "Que fais tu?" all have the same meaning of 'What are you doing?'?

Why do you use "des rôles intéressants". and "les nouveaux défis ? "

Bonjour au forum et à tous les experts 

Une question à propos  de la phrase -  'On a été extrêmement impressionnés par la profondeur des galeries'. 

Je  comprends c'est correcte, mais si je veux parler du passé plus récent, pourrais-je le mettre  - 'On était extrêmement impressionnés par la profondeur des galeries?' ou devrais-je le mettre 'on avait extrêmement impressionnés par la profondeur des galeries?'

Je suis un peux  confondu parce que 'était impressionné' me son correcte aux oreilles.  Par contre, 'on avait impressionné  ne m'apparait pas correcte de tout.  Cependant, tout ce que j'ai appris du grammaire me dirige à penser que 'impressionne' est un avoir verb qui utilise 'avoir' pour le faire passé

i've read with interest the discussion over what tense the subjunctive should be in, in some of these sentences. It all looks so heavy, especially in the spoken language. I'm pretty sure that in every day French, the French would go with the Present. Interested to hear your thoughts on my opinion, as trust me, a lot of French aren't as well schooled in their language as we are through Lawless French.

Merci!!!

Dennis