代词人称的混淆

请先看下面两个例句,然后再言归正题: He beats himself. He beats him.第一句中的He与himself是一个人,第二句中的He与him则并非一人。he是第三人称,因此有的语法家称此处的him为第四人称。第三人称的代词是容易混淆的,各种语言,莫不皆然: When Renneth(1)warned him(2)that his(1)medicines were useless at that stage of the malady,and he(1) needn’t put him(2)to further expense by attending her,he(2)retorted.当任乃斯(医生)告诚他说。