whose是就所有格提问,谁的
who 是就主格进行提问.谁
whom 是就宾格进行提问.谁还有更详细的吗已经很详细了孩子给你举个例子吧this is my book.对my 提问，就是whose book is this。tom played with Mary。对Tom提问，对主格提问，就是who played with Mary？对Mary提问，就是 whom does Tom play with？那在定语从句里什么时候用who.whom，whosei lost a book whose cover is blue.我丢了一本书，这本书的皮是蓝色的。主要是看成分，我们需要填的跟要修饰的词之间的关系。这个题目，cover 应该是the book's cover 对吧？书的封面，所以，要用所有格whose