三、Be动词的否定和提问

1、Be动词否定

在am、is、are、was、were后面加not

I am not back.
The man isn't back.
They aren't back.
He wasn't back.
They weren't back.

2、使用Be动词提问和回答

• Is he a teacher?

• Are you a teacher?

• Were they teachers?

3、Be动词否定练习

• 他是医生吗？

• 他们昨天在教室吗？

• 他们昨天不在教室。