On dit, it is said.
On danse, somebody dances.

5. Personne, used indefinitely, is always masculine and in the singular. As a subject to a verb it is followed by ne.

Personne ne me l'a dit,
No one has told it to me.

N. B.--As a noun it is always feminine, even when applied to a man.

Je n'ai vu qu'une seule personne,
I have seen but one person.

6. Quelqu'un, used in a general sense, is invariable.

Y a-t-il quelqu'un qui oserait nier ce fait?
Is there anybody who dares deny this fact?

Used relatively it varies.

Connaissez-vous quelqu'une de ces dames, quelques uns de ces messieurs?
Do you know any one of these ladies, some of these gentlemen?

7. Quiconque, in a general sense, is masculine. When referring to a woman it is feminine.