◆这个是最基本的知识，不能太简明，给你转一篇优质解答：
当人称代词作主语时,即用主格,而作宾语时用宾格.人称代词".请听:人称代词有两格,主格宾格要分清.主格常置谓语前,宾格处在介动后.开头主语用主格,宾格充当宾和表.(1) 动副联合成短语,宾格代词夹中间.(2) 代词并列作主语,排列顺序要记住.复数人称一二三,单数人称二三一.承担责任I领先,you站后面I心安.(3) 小小it,作用大,用法一一记心间.(4) 人称代词由主格和宾格两部分组成.主格和宾格各司其职,各有分工.主格人称代词用作主语,置于谓语动词之前?单数人称代词作主语时谓语动词要用单数形式,复数人称代词作主语时谓语动词要用复数形式,两个或两个以上的人称代词并列作主语时谓语动词要用复数形式.宾格人称代词用作宾语,置于动词和介词后,分别构成动宾和介宾结构?有时在口语中还用作表语.如:They are all students.(they作主语) Let me help you.(you用作宾语,构成动宾) The new bag is for him.(him用作宾语,构成介宾) -Who's that?-It's me,Tom.(me作表语) 回答人的补充 2009-11-28 08:06 关于提问者的补充问题,是的,是应该用THEM,因为我是主语,他们是宾语.英语中的人称代词(Personal Pronouns)有主格、宾格和所有格之 分,如：I,me,my ; he,him,his ; they,them,their等.顾名思义,主格(The nominative case)用作主语,宾格(The objective case)用作宾语,所有格(The possessive case)则表示所有之物.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：⒈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".⒉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"后头分句的主语和词动都要完整出现的话,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.(12)a和b都被接受,但(12)a等于(13)a,而(12)b等于(13)B：(13)a.Jason praised Maria more highly than I did (= I praised Maria).b.Jason praised Maria more highly than he praised me.显然,这两句的深层意思大有差别.遇到这种情形,为了避免误解,不妨根据要表达的意思用完整的句式表达出来.换句话说,必要的话,要用(13)这句子.不然,把(13)a变成(14),(13)b变成(15)也可：(14)I did not praise Maria as highly as Jason did.(15)Jason did not praise me as highly as he praised Maria.