- 3. 人称代词的用法
3.1 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。
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 doy is small. It is Tom’s.
3.2 人称代词的句法功能
3.2.1 人称代词有主格和宾语之分：主格用作主语，宾格用作宾语。
3.2.2 人称代词的主格形式在在句中作主语和表语。
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)?
3.2.3 人称代词的宾格在句子作动词的宾语，或者介词的宾语。
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)
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。
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。
He sings better than I/me. 他比我唱得好。
You know more than she/her.
She is as tall as 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。
“I like English.” “我喜欢英语。”
“Me too=I like English too.” “我也喜欢。”
——Who did it?
——Them. (=They did it)
