代词当主语
主系表结构（主语、谓语、标语）。例句：小明是学生。
- 主语：名词、代词
- 谓语：be动词（is/am/are）
- 表语：名词、代词、形容词、副词、介短
| - | 主语 | 谓语 | 表语 |
|---|---|---|---|
| 单数 | he、she、it | is | a/an+名词单数 |
| 单数 | i | am | a/an+名词单数 |
| 单数 | you | are | a/an+名词单数 |
| 复数 | you/we/they | are | 名词复数 |
Example：
I am a man.
You are a woman.
He is a teacher.
She is a student.
It is a baby.
It is a dog.
We are wen.
You are Women.
They are teachers.
They are students.
They are babies.
They are dogs.
肯定句
| 主语 | 谓语 | 表语 |
|---|---|---|
| 三单 | is | 名n、代pron-宾格、形adj、副adv、介prep（介宾） |
| i | am | 名n、代pron-宾格、形adj、副adv、介prep（介宾） |
| 其他 | are | 名n、代pron-宾格、形adj、副adv、介prep（介宾） |
辨认人称
| - | 第一人称 | 第二人称 | 第三人称 |
|---|---|---|---|
| 单数 | I | You | he/she/it/a cat/water |
| 复数 | We | You | They/two cats |
名词做表语
I am a man.
adj做表语
The boy is tall.
The girl is short.
副词做表语
I am here.
You are there.
介词做表语
She is at home.
否定句、疑问句
否定句
She is not a student.
They ate not students.
The body is not tall.
The girl is not short.
I am not here.
You are not there.
She is not at home.
一般疑问句
Is she a student?
Are they students?
Is the boy tall?
Is the girl short?
Am i here?
Are you there?
Is she at home?
特殊疑问句
提问主语：语序不变
1、谁高？
2、谁在那里？
3、谁在家？
4、谁是Tom？
提问非主语：特+一般疑问句
5、我是谁？
6、你在哪里？
Who is/are tall？
Who is/are there？
Who is/are at home？
Who is Tom？
Who am I？
Where are you?
