Could you contrast the use of quelqu'un with personne please? is that latter used in negative sentences only?

Question

Cécile Janty-Davies · Accepted Answer

Hi Chris,
Technically speaking , ‘personne’ is the opposite of ‘quelqu’un’.
Personne n’est encore arrivé = Nobody has arrived yet
 
Quelqu'un est déjà arrivé = Someone has arrived already 
Hope this helps!

Thy Momo · Answer

Hello Cécile,I have a tiny question about your example: "Personne n’est encore arrivé"I see that "personne" is feminine but the verb "arrivé" is not according with the gender of "personne". Is this how it's supposed to be?

Cécile Janty-Davies · Answer

Hi Thy, 
Personne is noone/nobody, not the same word as 'une personne'.
Take a look at the following lesson -
Adjectives after personne, rien, tout le monde, quelqu'un are always masculine in French