determiner: used to refer to one or some of a thing, no matter which
Pick any book from the shelf.
determiner: used in questions, negatives, or conditionals to indicate even a small amount or number
I don't have any time left.
determiner: each without exception; every
Any student who completes the course receives a certificate.
pronoun: one or some of whatever kind, taken from a group
Any of these keys should open the door.
adverb: at all; in some degree (used for emphasis)
I can't run any faster.
