肯定句用some, 否定句和问句用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)

这篇到底在说什么啊...any本身在negative和positive两种语意极性状况下的意思又不一样一般说的否定句用any本来就不是指任意意义的any都这样用在说such a rule is nonsense前也该先知道那个rule真正的意思是什么吧(一个any是指任意数量，另一个却是it doesn't matter which，不能混在一起讲