"On" substitutes for "il" or "elle"?
How does "On" work in a sentence, I am know it means "we" but can it be used for something else? Is "Il a parti pour la ville parce qu'on veut trouver sa fille." correct?
Like Jimmy said, it means "one", as in How does one accomplish that?
Although, it seems to me that the French use "on" more often than anglophones use "one". We use it emphatically, mostly. For example: One cannot simply say, "because it pleases me!" One must explain why. That would be an emphatic statement, whereas the French use it regularly and frequently, and it might get translated into English as one, we, you, they, it, he, she, whatever.
e.g., Quelqu'on a volé mon sac !
(Somebody nicked my bag! or Someone swiped my bag!)
On va au musée.
(We're going to the museum.)
It is unlikely that a native anglophone would say "One stole my bag" or "one goes to the museum." These translations are context-dependent.