谁能帮我区分who whom whoever?

谁能帮我区分who whom whoever?
偶知道whom是who的宾格~whoever是用在状语从句```
但是一看到题目就不会了````
谁能让偶弄明白?

多找些类似的语法题做做,好好揣摩一下,就好了
Who told you the story?（主语）
Whom did you give the book to?（介词宾语）
whom是who的宾格,在现代英语中一般只用于书面体,在口语中通常用who,但在介词后只能用whom.
whoever 不管谁,是用在状语从句中
举个例子：
Whoever broke the glass must be punished.
Don't open the door,whoever he is.