what about some milk?中some为什么不变any

What about some steak?中为什么不用any what about some steak?中的some为什么不是any?问句中不是any吗? what about some sugar?中的some为什么不用any what about some beef?为什么用some 不是any what about（.）milk.1.any.2.chicken.3.have.4.some 新概念英语的49课第四段中“What about some steak?”,为什么是some,而不是any? what do you want some writing paper for?这句话中的some 为什么不变any? 为什么在一般疑问句中some不变any?在would you like some mutton?中 what about some steak?为什么用some 而不用any 不是说any 用于疑问句和否定句里吗? when do you do some homework中some为什么不变any would 的疑问句中some不变any Could i have some carrots?为什么some不变any