The indefinite pronoun “anyone”—used as a single word—refers to any person at all, but not to any particular individual. “Any one”—used as two words—is an adjective phrase that refers to any single member of a group of either people or things. “Any one” is commonly followed by the preposition “of.”
Example:-
1. “Did anyone of you see a lost boy?” the frantic mother asked.
2. When I visited the art gallery in Paris, I could not decide on “any one” painting that was my favorite.
