Form and rules
How it works
Use a/an with one singular countable noun: a chair, an apple.
Use some with plural countable nouns and uncountable nouns in many positive sentences: some books, some rice.
Use any with plural countable nouns and uncountable nouns in many questions and negatives.
Some is common in offers and requests when we expect or hope for a positive answer: Would you like some tea? Can I have some water?
Uncountable nouns such as water, money, information, and furniture do not normally have a plural form or use a/an.