French language Q&A Forum

"Elle veut que tu fasses la grasse matinée demain matin."

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

If the verb is se passer, should it not be "Comment tes vacances se sont-ils passées" 

If the verb is simply passer, should it not be "Comment sont passées tes vacances"

How to make negative passé composé  sentences 

"Je veux rien" marked as incorrect on the test.

I understand it's not the strictly proper, dictionary-perfect way to say that, but it's valid and there was no indication in the way the question was phrased that it was specifically the ne construction I was expected to use -- and nothing else.

I know that ils is used for masculine or mixed masculine and feminine groups and elles is used for feminine groups. But what if there are more feminine than masculine objects such as a group of one man and ten women? Would it then be acceptable to use 'elles' to refer to that group or would I still have to use ils even if only thing is masculine?

The lessons says to use either. Where is the explanation/lesson details? 

How do you know what gender a word is if it's not a person