as a determiner (followed by an uncountable noun): I’ll make some coffee. (followed by a plural noun): ♦ She brought me some flowers. (followed by a singular countable noun): ♦ She married some guy she met on the boat.
as a pronoun (without a following noun): The cake’s wonderful. Won’t you have some? ♦ Many fought and some died in the struggle. (followed by ‘of’): ♦ Some of the apples were rotten.
as an adverb (followed by a number): The car stopped some twenty-five yards from where we were standing. (after a verb in American English): ♦ His condition had worsened some.