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.