1、who 是做主语成分 后面接动词如 who did it? whom 是做宾语成分 动作的对象如 whom did you give the pen to如果改成祈使句就很明白you gave the pen to whom( 宾语）whose 是 谁的？ 后面+名词whose book is this?一般回答 my book。

2、 his book 什么的。