花桥英语培训专家KooTalk之 免费语法知识讲解：

A verb shows action or a state of being.

动词可以描述一种动作，状态的转换，或者状态。

I go home. Home is my place to rest. I like the smell of my house. I feel totally relaxed. Home refreshes me. At home, I get ready for a new day.

而完全描述状态的动词就是Be动词。

“Be” verbs indicate a state of being.
花桥英语培训专家KooTalk知识点讲解：
Verbs must match subjects. Be动词必须匹配相应的主语以及单复数：

• I am a doctor.
• He is sleepy.
• We are here.

Negative sentences need ‘not’ after the verb.

在后面加上Not来表示否定的含义。

• I am not a doctor.
• He is not sleepy.
• We are not there.

The verb comes first in interrogative sentences.

在一般疑问句中，我们将Be动词提前，进行疑问倒装：

• Am I a doctor?
• Is he sleepy?
• Are we there?

“Are not” (is not) can be shortened to “aren’t” (isn’t).

可以缩写为  “aren’t” (isn’t)

• He isn’t sleepy.
• We aren’t there.

Remember the variations of “be” verbs:
花桥英语培训专家KooTalk请大家掌握如下的Be动词形式变换：

Present	Negative	Interrogative
I am	I am not	Am I?
You are	You are not (aren’t)	Are you?
He is	He is not (isn’t)	Is he?
She is	She is not (isn’t)	Is she?
It is	It is not (isn’t)	Isn’t it?
We are	We are not (aren’t)	Are we?
You are	You are not (aren’t)	Are you?
They are	They are not (aren’t)	Are they?