French language Q&A Forum

The question and answer: J'ai fini. - Write "I didn't finish." : Je n'ai pas fini
makes me wonder... In English 'I have not finished' implies you are still working on it, whereas 'I did not finish' implies that you are not still working on it (e.g. you ran out of time in an exam). It looks as if the passé composé could mean either of these. Right? If so, what is the easiest way to make this distinction in French?

I still don't understand why "les" is the answer but not "ses". Please explain, thanks!

In the last sentence I typed "quand ils partent de mon salon !" but "partent de" marked as an error and advised "quittent" or "sortent de". 

Could you please explain why "partent de" cannot be used here as an option ?

For "partir", in the relevant lesson, it is written as: "When used with a place, it will always be followed by a preposition (e.g. I leave from / for  = Je pars de / pour)" Example: Je pars de cette ville.

I would like to know what the " l' " refers to in this sentence:   

Seriez-vous partis si je vous l'avais demandé? 

Would you have left if I had asked you?        

I can only surmise that it means something like: 

Why il y a du soleil and not il fait beau ?