French language Q&A Forum

I'm confused when to use penser à and when to use penser de, and why you would say "la fille à laquelle je pense" instead of "la fille dont je pense" 

Bonjour! I have definitely heard an excited new dad exclaim, “Je suis Papa!”  

Is there a difference between what is correct and what is actually said?

Personne n'a ses clés ?
Does nobody have their keys ? 

"Does nobody have their keys?" strikes me as something that would rarely if ever be said in (American) English. Is there another correct way to translate this? Because this one will be really hard for me to remember because it seems so very strange.