what do you want some writing paper for?这句话中的some 为什么不变any?

what do you want some writing paper for?这句话中的some 为什么不变any? Do you have some more paper?为什么不用any more? There _____ some writing paper on my desk .Do you want ___? do you want some wine 和do you need any shopping中为什么want加some Do you want 后面为什么是some不是any? when do you do some homework中some为什么不变any Do you want to eat some chicken,John?这句话是疑问句,为什么还要用some? Do you some paper some用于肯定句,any用于否定句或疑问句.为什么本句例外? DO you want any milk?any为什么不可以是some（看问题补充） ---What do you buy the colour paper for?---______(make)some would you please give me some writing paper?writing为什么加ing? -Do you have any writing paper?-Yes,we do.为什么回答不是Yes,I do