French language Q&A Forum

I understand from the disucssion that you can use depuis with the present tense or passé composé but I have this question:

Depuis quand est-ce que vous êtes vous mariés ? ( a point in time in the past)

Asking a person who is married how long they've been married (and still are): Vous êtes vous mariés depuis 30 ans? (Past tense so does this mean they're no longer married?)  or, should you say, Vous êtes mariés depuis 40 ans? (still married).

This always trips me up so thank you ahead of time for your help!

The last sentence is Elle n'en croira pas ses yeux!  Why is "en" used in this context?

activity in french for k

Quel est le genre grammatical de 'Paris', et pourquoi pas 'à la campagne' au lieu de 'dehors de la capitale' ?

When can you use  in past tense or 

Please provide further explanation about the phrase "Peut-être qu'elle est allée dire bonjour..."  I believe that in English, we would write it, "Perhaps she went to say 'Hello' ..."  Why does French not have quote marks around something that is said?  For example, how would you write the following in French:  The farmer said, "I'm going into town to buy a cat."?

Hello! How can I correctly invite someone to walk to the park with me? Thank you!