be动词的用法

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-动词 be (verb to be)的用法
1、基本形式
I am ，you are ，She is，We are，They are
He is (not) a ...student.
It is (not) a desk.
You are (not) ...students.
2、否定形式
are not=aren't
is not=isn't
3、疑问形式及答语
Am I...?
Yes, you are.
No, you are not.
Are you ...?
Yes, I am.
No, I am not.
Is he(she, it) ...?
Yes, he (she, it) is.
No, he (she, it) isn't.