can I drink some water ?一般疑问句不是要把some改成any吗？为什么这里要用some?一般什么情况用some?

如果问句是希望得到肯定回答，或者邀请别人吃东西，则用some,不用any
如：Would you like some milk?
Can I ask you some questions?
What about some water?

if you wanna use - any - you can say that can i drink any kinds of water, well, which is not the popular way of saying that. some means that certain kind of water here, and which is the common way putting this idea into words.

can I drink some water ?不算一般疑问句

表示乞求时some不变成 any

暗示对方我希望得到肯定回答。

恩 上面说的