be afraid of+人称
宾格形式，如be afraid of him,(害怕他).
人称代语的
主格形式都有相对应的宾格形式。
通俗说，主格就是做主语的，宾格就是做宾语的。
如人称代语主格有：
单数的：I - you-he/she-it 复数的：we-you-they-they;
I am happy.
They are playing.
对应的宾格形式为:
单数的：me-you-him/her-it; 复数的：us-you-them-them
He likes her.
Your teacher hate us.