在实际运用中,主格和宾格代词有时会混淆。下面是常见的问题:　　1.在复合结构里, 人称代词的主格和宾格在单独使用时,没有问题,如很少人会犯下这样的错误:　　*(1)Wilcox spoke to I.　　*(2)Her knew what had happened.　　但在复合结构中,错误就难免了,如:　　*(3)Wilcox spoke to my friend and I.　　*(4)He and her knew what had happened.　　*(5)This is between you and he.　　这种错误是可避免的。第一,在有介词的复合结构中,特别要注意,第二个人称代词,必须用宾语,如:"for you and me"和 "between Maria and him"。第二,试把复合结构中的另一部分暂时用括号围起来,那么该用的格就容易辨别了,如:　　(6)This message is for (My father and) I or me.　　(7)(Marry and) he or him went downtown together.　　显然的,(5)里的代词是宾格的"me", (6)里的代词是主格的"he"。　　2.在比较结构里, 连接词"as"或"than"后面,按理用主格式,但在口语中,人们常用宾格形式,学美式英语者,更是如此:　　(8)a. You did as well as she.　　b. You did as well as her.　　(9)a. I am older than he.　　b. I am older than him.　　(a)和(b)两种说法,都可接受。但如果"as"和"than"后头分句的主语和动词都要完整出现的话,这时的人称代词,就必须是主格,如下:　　(10)You did as well as she did.　　(11)I am older than he is .　　此外,还有一点要注意,就是"as"和"than"后面虽然在语法上用主格好,用宾格也可,但是有时意思会有所不同。试比较(a)和(b):　　(12)a. Jason praised Maria more highly than I.　　b. Jason praised Maria more highly than me.　　(