French language Q&A Forum

How to form interrogative?

Why is it sometimes before the noun and sometimes after when used as an adjective? And I see some patterns in it's placement as an adverb but if you have any advice on that as well that would be great.

Can someone please tell me why HIS in question one is La and not Sa? I have contacted two French teachers who both say the answer to this question is Sa referring to someone else and would only be La if referring to yourself....

Please advise per my screen shot above... 

Thank you in advance

Salut a tous

Tu ne sais pas qui l'a fait.  You don't know who did it.

and

Je ne sais pas ce qui se passe.  I don't know what's going on.

We have here QUI as who and QUI as what.

How do I know to use QUI rather than QUE for what

Merci

The passive voice in several examples where we needed "was sent" and "had prepared" used plus que parfait ie) était envoyé and avait préparé, but for "the students were welcomed", my use of étaient accueillis was incorrect and the correct answer was the p.c.: Les étudiants ont été accueillis was correct. This seems illogical to me. Please explain the difference.

This was the question: 

From a drop-down multiple choice, I answered that it meant "I have everything" but I wasn't sure that was correct because of the "les"

The correct answer was, "I have all of them," but couldn't that be written as, "J'en ai tous?" That's where I got confused.

Si je changeais maintenant here you have used imparfait can I use passé composé here

For Indiana Jones lived through extraordinary adventures 

I used "a vécu par" for "lived through".  Is this incorrect?