Anybody, anyone, anything, anywhere
These words are used in questions and negative sentences, to refer to a person, thing or place, without identifying which person, thing or place.
anybody / anyone: an unidentified person
anything: an unidentified thing
anywhere: an unidentified place
Are you seeing anybody else?
I've just moved to a new town, and I don't know anyone.
I haven't had anything to eat since I arrived.
'any-' words are also used to express conditions:
'You can park anywhere' = 'if you need a place to park, use one of these spaces.'
'It's easy to find. Ask anyone' = 'if you can't find it, ask someone: everybody knows where it is.'