French language Q&A Forum

why is verb avons montrés not avons montré?

I came across this question in the quizzes. Why are these two sentences correct? One uses the feminine form and the other the masc. They are both referencing the time in the past. How does one determine if it is about the duration or precise moment?

“J’ai passé la journée avec Martin.”

I spent a day with Martin

“J’ai passé un an en Espagne quand j’avais dix-neuf ans.”

I spent a year in Spain when I was 19

In the summary translation at the end of the exercise, you propose 'elle ne cachait plus sa bouche' as opposed to 'la' bouche previously in Kwizbot's answer. Is this difference sometimes a matter of personal preference?

Is there a difference between "Nous mangerons dans 30 minutes" and "Nous mangeons dans 30 minutes"? My understanding is that it's a subtle difference (e.g, "we will sit down to eat 30 minutes from now" vs. "we're sitting down to eat 30 minutes from now"), but both ultimately refer to the beginning of the action in the future. 

In this example, "You are leaving next Tuesday, aren't you", the correct answer used the present tense to indicate immediate future, but next Tuesday is not the immediate future.  What is the cut-off?  A week? A month? It varies?

Why does dans la salle not work in this instance please?