as a determiner (followed by a singular countable noun): It’s a puzzle that any intelligent child could solve. (followed by a plural or uncountable noun): ♦ Are there any biscuits left? ♦ He hasn’t got any money.
as a pronoun (without a following noun): I looked around for toilet paper, but there wasn’t any. (followed by ‘of’): ♦ Have you read any of his books?
as an adverb (usually followed by the comparative form of an adjective or adverb): Are you feeling any better?
Any is used especially in questions, in negative sentences, and in clauses with ‘if’: Is there any coffee left? ♦ There weren’t any complaints. ♦ I can lend you a map if that’s any help.