英语人称代词分为主格和宾格:
主格:I, you, he, she, it, we, you, they
宾格:me, you, him, her, it, us, you, them
人称代词在句中作不同成分时有不同的形式,如:主格、宾格、第三人称单数形式等。
使用人称代词的注意点:
1、指代国家、城市、地球、船舶、(雌性)动物等时,一般用代词 it,但也可用she / her(带感情色彩)。如:My car’s not fast, but she does 50 miles to the gallon. 我的车不快,但每加仑油它能跑50英里。
2、 当上文提到的人的性别不明时,一般用 he / him 来指代。如:Whoever told you that, he was lying. 无论谁对你那样说,他都在说谎。
3、代词we, you, they 有时可用于泛指一般人。如:We [You] ought to obey the law. 大家都应遵守法律。
以上内容参考:百度百科——英语人称代词
人称代词的用法
1) 定义:人称代词是用来指代人、动物或事物的代词。它必须在人称(第一人称、第二人称、及第三人称)、数(单数、复数)以及性(阴性、阳性、中性)三方面与被指代的名词一致。
如:I am a student. Tom is a boy, and he is a student.
Mary is very pretty, and she likes singing.
The boys are students, and they are in the room.
The dog is small. It is Tom's.
2) 人称代词的句法功能
A) 人称代词有主格和宾语之分:主格用作主语,宾格用作宾语。
B) 人称代词的主格形式在在句中作主语和表语。
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)?
It might have been she.
C) 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(宾语).
I haven't seen them recently.(宾语)
I bought a book for them.(作介词宾语)
=I bought them a book.(间接宾语)