Be动词的否定

在am,is,are,was,were后面加not.
缩略式 : am not ,isn’t,aren’t,wasn’t weren’t.
翻译成不是 或者 不怎么怎么样…

例句
1.The man isn’t back.
2.I am not back.
3.They aren’t back.
4.He wasn’t back.
5.They weren’t back.

使用be动词提问和回答
I 用am,you 用are ,is 连着he,she ,it.
Is he a teacher?
Yes,he is / No he isn’t.

Are you a teacher?
Yes ,I am/No ,I am not.

Were they teachers? 他们以前时老师吗
Yes ,they were. /No they weren’t.

Be 动词练习.
1.他是医生吗？
Is he a doctor?

2.他们昨天在教师吗？
Were they in the classroom yesterday?

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bilibili
https://www.bilibili.com/video/av2639206/?p=3