There are six ties here,which one do you want?

题目

There are six ties here,which one do you want?
上面的which one 为什么不能用which ones 表示“你想要哪几个”?

答案

one就是一,一就是一,one后面加个s不会变成二（而且也没有『ones』这一词）,
这里是问你要哪个,如果是要『几个』的话,应该是这样问的：
There are six ties here,how many do you want?