先简单介绍下两个常见句型，方便我们理解本文列出的几个表格。
常见句型一：“主谓宾结构”，即由“主语 及物动词 宾语”构成。
例句：He ate an apple.
He（主语） ate（谓语） an apple(宾语).
常见句型二：“主系表结构”，即由“主语 系动词 表语”构成。
系动词：最常用的系动词是"be"(am,is,are)，另外还有look,get,become等。
例句：It is a cat.
It(主语) is（系动词） a cat（表语）.
一： 人称代词主格（在句子中作主语。）第一人称单数： I am a student.
第一人称复数：We are students.
第二人称单数： You are a student.
第二人称复数：You are students.
第三人称单数： He is a student.
She is a student.
(It is a cat .)
第三人称复数： They are students.
(They are cats.)
二： 人称代词宾格(在句中作谓语动词或介词宾语。)
（1）作谓语动词宾语
第一人称单数：Tom often helps me.
第一人称复数：Tom often helps us.
第二人称单数：Tom often helps you .
第二人称复数：Tom often helps you.
第三人称单数：Tom often helps him.
Tom often helps her.
Tom often helps it.
第三人称复数：Tom often helps them.
（2）作介词宾语
第一人称单数：This apple is for me.
第一人称复数：These apples are for us.
第二人称单数：This apple is for you.
第二人称复数：These apples are for you.
第三人称单数：This apple is for him.
This apple is for her.
This apple is for it.
第三人称复数：These apples are for them.
三： 形容词性物主代词（做定语）
第一人称单数：These are my pens.
第一人称复数：These are our pens.
第二人称单数：These are your pens.
第二人称复数：These are your pens.
第三人称单数：These are his pens.
These are their pens.
These are her pens.
These are its food.
第三人称复数：These are their food.
表格四： 名词性物主代词（可以作主语也可以作表语）
（1）作表语
第一人称单数：This apple is mine.
第一人称复数：These apples are ours.
第二人称单数：This apple is yours.
第二人称复数：These apples are yours.
第三人称单数：This apple is his.
This apple is hers.
This apple is its.
第三人称复数：These apples are theirs.
（2）作主语
Tom's apple is green. ____ is (are) red.
第一人称单数：Mine is red.
第二人称复数：Ours are red.
第二人称单数：Yours is red.
第二人称复数：Yours are red.
第三人称单数：His is red.
Hers is red.
Its is red.
第三人称复数：Theirs are red.
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