1、人称代词有主格和宾语之分：主格用作主语和表语，宾格用作宾语。如： I like music（主语）.She is a teacher. （主语）She and I are good friends（主语）.Neither she nor I am student.--I saw the boys this morning.--Are you sure it was they（表语）？2、人称代词的宾格在句子作动词的宾语，或者介词的宾语。如：I saw him at the party（动词see的宾语）。I haven't seen them recently. （动词see的宾语）I bought a book for them.（作介词for的宾语）=I bought them a book.（作介词buy的间接宾语）注意：a.在口语中，人称代词的主格形式作表语时，常常可以用宾格替换。如：It can't be he/him.--Is this Mr. Green?--Yes, this is he/him.b. 在口语中，当人称代词用于than, as 之后或用于强调句中被强调时，用主格（较正式）和宾格（较口语化）均可以。如：He sings better than I/me. 他比我唱得好。You know more than she/her.She is as tall as me （me=I am）。c. 单独使用的人称代词通常用宾格，即使它充当的是主语也是如此。如："I like English." "Me too=I like English too." "我喜欢英语。""我也喜欢。"--Who did it?--Them.（=They did it）
