为什么不用whose

please pass me the book whose cover is green 为什么要用whose不用 wh the child whose mother has left him is crying loudly.为什么不用wh The boy()is standing there is my brother他是我的哥哥,为什么不用所属whose? a which b whose c its d where 选什么 考察什么语法 为什么不用which whose为什么等于which of WHOSE BAG IS IT 为什么不 whose bag it is whose bag is this 为什么这里用whose whose Whose can it be 和whose would it be为什么只能说whose can it be 为什么不能说Whose is this book? “The room whose window faces south is mine”引导词为什么要用“whose”,不 whose is this handbag?能不能换成whose hangbag is this?为什么?