Anyone, anybody and anything are indefinite pronouns. We use anyone, anybody and anything to refer to both an open, unlimited set of things or people and specific things or people. We use them with a singular verb:
Has anyone got a dictionary?
Anybody is welcome to join. There aren’t any rules.
Can I do anything to help?
I don’t know anybody who speaks Portuguese.
We often use the plural pronoun they to refer back to (singular) anyone when we do not know if the person is male or female:
If anyone would like further information about the dogs, they should call Canine Rescue on 0502 75257. (The same as Ifanyonewould like further information about the dogs, he or sheshould call Canine Rescue on 0502 75257.)
Anything, anyone, anybody don’t have a negative meaning on their own:
We stayed in Sevilla for the rest of our holidays. No one wanted to come back, but we had to.