1.人称代词的主格作主语,宾格作动词的宾语和介词的宾语。例:
They have English lessons on Saturday. 他们星期六上英语课。
The teacher asked them to stay in the classroom. 老师叫他们呆在教室里。
We are listening to them. 我们在听他们说话。
2.人称代词作表语时,一般用宾格,特别是在日常会话中。例:
“Who is knocking at the door? ” “It's me. ” “谁在敲门?”“是我。”
在很正式的英语中也用主格,可以说:It is I.
只有一个词的句子用宾格:
“Who wants to try?” “ Me.” “谁想试一试?”“我。”
在“it + be + 代词 + 定语从句”结构中,用宾格是随便的说法,用主格是非常正式的说法。例:
It was me/ I who broke the window. 是我打破了玻璃窗。
为了避免太正式或太随便,我们可以用别的句式来表达。例:
I was the one / person who broke the window.
3.人称代词处在动词之前,会影响选用主格还是用宾格。例如 but和except 既可作介词也可作连词,因此在but或except之后,用主格还是用宾格就要慎重。例:
No one but / except I read the book.
No one read the book but / except me / I. (me 比I 更常见)只有我读过这本书。
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