根据剑桥语法，一般规律是：
1、肯定句用some；2、否定句用any；3、疑问句通常用ang，但在希望得到肯定回答的疑问句中用some。
剑桥语法原文如下：
1. Some is most common in affirmative clauses（肯定句）.
例：
- He’s got some homework.
- Not: He’s got any homework.
2. Any is most common in negative clauses（否定句）.
例：
- He hasn’t got any homework.
- Not: He hasn’t got some homework.
3. Any is more common in questions（疑问句） but we can use some when we are expecting the answer to be ‘yes’.
例：
- Has he got any homework?
- Has he got some homework?
注：这两句都正确，但后一句期待的回答是yes，而第一句表明的态度是“事不关已，问问而已”。
原文：https://dictionary.cambridge.org/zhs/语法/英式语法/some-and-any?q=Some+and+any
