1)some, any, no既可用于可数名词也可用于不可数名词，表示不肯定的数量。
【例如】
I have hardly any coffee left.
There are some books and a pen on the table.
Hurry up, there is no time left.
* no用作限定词，相当于not any/not a.
【例如】
This old man has no relatives, so he has to depend on his neighbors for a living.(This old man doesn t have any relatives, so he has to depend on his neighbors for a living.)
2) any通常用于否定句或疑问句，some用于肯定句。
【例如】Do you have any questions about the passage?No, I don t have any questions about it, but I have some questions about the assignment.此外，* some也可用于疑问句，表示说话人希望得到肯定回答。
【例如】
Would you like to have some tea?Would you mind buying me some sweet?* any常用于if引导的状语从句。
【例如】
If any letters arrive for me, can you sent them to this address?If you have any requirement, you can ask me.* any也可以用于肯定句，表示任何。
【例如】
The medicine is on sale everywhere. You can get it at______chemist s. (CET-4 1997,6)
A) each B) some
C) certain D) any
each表示各个，some表示一些，certain表示一定的，any用于肯定句时，表示任何，故根据意思，答案为D。
3) some, any, no可以与more连用，表示“更多”。
【例如】Please give me some more water, for I am really thirsty.I have no more good ideas. I am at my wit s end.Do you have any more books available?
4) some, any与单数可数名词连用时可表达特定含义。
【例如】
Any boy in the class can pass the exam. (any boy=every boy)Some guy did it without being known by the others. (some＝a certain)