French language Q&A Forum

I have read earlier that while doing negation in avoir we should  change the articles into de for example.. J'ai un Stylo 

Je n'ai pas de Stylo. Then how to follow this rule while using verbs 

Another problem I have here is with the explanations in the lesson. It says that when talking about SOMETHING SPECIFIC, you should use elle/il. But then there's this example: Qui est Sylvie ? - C'est ma sœur. 

I would think that here we are talking about a very specific Sylvie, and not just some Sylvie. Then why do we say c'est instead of elle? 

ll envoie les fleurs à Sophie

to 

ll les lui envoie. Why not 

ll lui les envoie 

is this totally wrong? Please clarify. Thank you. 

hi room, experts: 

Please explain why sentence, 'And it was with stars in my eyes that I came out of that magical place!' translates as,  Et c'est avec des étoiles plein les yeux que je suis sortie de ce lieu magique

My question refers to the usage of the word, 'pleins'. I am wondering if 'pleins' is being used as a preposition here in the same way that 'dans' is, and if so can it be used as an alternative in other case too.

Please clarify, Thanks