Use "some" in positive sentences for both countable and uncountable nouns.
I have some friends. (Positive)
Use "any" in negative sentences or questions for both countable and uncountable nouns.
Do you have any cheese? - He doesn't have any friends in Chicago. (Negative)
Try These :
Q: Is there ____ who can help me?
anyone
someone
Q: My friends said _____ would be here today.
anyone
someone
Q: Have we got ___ milk in the fridge?
any
some