肯定句用some, 否定句和問句用any.
Such a rule is nonsense as the following examples show:
I like some pop music.
I don't like some pop music.
I like any pop music.
I don't like any pop music.
(Practical Techniques for Language Teaching, by Michael Lewis and Jimmie
Hill)

這篇到底在說甚麼啊...any本身在negative和positive兩種語意極性狀況下的意思又不一樣一般說的否定句用any本來就不是指任意意義的any都這樣用在說such a rule is nonsense前也該先知道那個rule真正的意思是什麼吧(一個any是指任意數量，另一個卻是it doesn't matter which，不能混在一起講