I'm french and I've just seen the topic: tell me what you want to know, I'll do my best to explain!
The explanation I've read are good there're some mistakes :
they're getting cook: Ils sont en train d'ĂȘtre cuits but it's better to say: Ils sont en train de cuire.
For quelqu'un=somebody
for example: There's someone in the street: il y a quelqu'un dans la rue
personne: always negative contrary to english:
il n'y a personne
There's nobody...
rien: negative too:
Il n' y a rien
There's nothing...
Tell me if it's not clear!