French language Q&A Forum

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 ?

The Collins dictionary provides the expression 'difficile à fair' and in the randomly generated examples of 'difficile' gives difficile d'atteindre; difficile à réaliser. difficile à modéliser. Is there a rule as to when 'difficile' is followed by 'de' OR 'à' and does this apply to other adjectives such as in the expression 'dur de choisir' which is given as an alternative answer in the exercise. 

I'm sure there is a lesson on this but my mind seems to have gone blank regarding it. Thanks in advance.

Which is correct? 

Je me suis réveillée tard aujourd'hui      ou

Je me suis réveillée en retard aujourd'hui ?

Please explain.

Could you please explain why C'est and Il est seem interchangeable when in the lesson 'C'est vs il/elle est: saying it is/she is he is' these expressions have separate uses depending on context. Thank you.

Unrelated but in the example  "Elle est descendue à la cave chercher une bouteille de vin." Why wasn't "pour chercher" used rather than just "chercher"? Is there a difference in meaning?

Elles ne connaitront jamais mon secret is the given answer. Why will savoir in the future not do? Various dictionaries suggest they are equivalent for this kind of statement.

Salut! Is it incorrect to say ils font aussi instead of ils font également? The alternate option was ils fabriquent aussi, but font aussi was marked incorrect. Wondering if there is a reason for that or is if acceptable?