1.用作形容词,修饰可数或不可数名词,如:some books,some water.
2.一般用于肯定句,但表示征求意见,希望得到肯定回答的疑问句也是用some,如:Would you like some water ? Yes, thanks.
3.用作代词。如 ---Do you have any books?---Yes ,I have some.
4.用作副词,相当于about,“大约”的意思。如,I waited some ten minutes.