French language Q&A Forum

Why and when do we use the accent above the o

I was marked wrong in a quiz for "Tu achètes une nouvelle voiture demain". It wanted "Tu vas acheter une nouvelle voiture demain". How does this differ from the example in this lesson "Je viens demain".

In writing challenge "Problems at the hotel" - Quel est le problème?

I wrote "Qu'est-ce qui est le problème? - can this be correct as well?

I thought that between noon and midnight (including midnight), one never used "moins", but always used minutes past.  Or, is midnight perhaps regarded as a.m.?

I can't find it in any lessons which explain this, other than one example in the A1 lesson.  There is no explanation, however.  Can you please explain to me the rule about when you can and cannot use "moins"for minutes to the hour.

Thank you

Writing challenge c1 camping:  Although she had already been camping in this forest for a week. 
Bien qu 'elle campe déjà dans cette forêt depuis une semaine.

I understand that bien que triggers the subjective and confirming my assumption that campe is used because she was still camping at the time, but not sure why the subjective passé is also right. Does already effect the tense in this case.