French language Q&A Forum

"l'hombre de grands arbres"  was my answer and it was wrong because I had omitted the "s" from des.  Can anyone explain why in this case one should keept the "s" on des?

I was in the town hall in "Le Broc" yesterday, and the sign said "La mairie de Le Broc". Are you sure you've got this rule right? Following this train it would be "Elle va a Le Broc", not "Elle va au Broc". However I did notice that there were somes signs in the town saying e.g. "Carroserie xx du Broc", so it seems like there's some ambiguity here. I would assume the town hall would be correct?

I am searching for some pattern in the placement of an adjective when it modifies a noun also modified by a prepositional phrase.  Our paragraph has two examples where the adjective, traditional, modifies such a noun.  The first concerns "dinde rôtie aux marrons".  There were a number of possibilities given for the position of traditionnelle including directly in front of dinde.  The second usage is in the last sentence where traditionel modifies plats de Noël.   Following the example from the first usage, I placed traditionnels in front of plats thinking that plats de Noël should be kept together.  This was marked as incorrect and I see that traditionnels is placed in the customary position after the noun and in front of de Noël.   Is there rule that one can apply to the placement of adjectives when they modify a noun also modified by some sort of prepositional phrase such as plats de Noël or dinde rôtie aux marrons ? 

why in this exercise is the nous form used one time and the on form another when they are both times speaking about what they will do together?