be动词的否定和肯定回答（be动词的否定询问）

be动词的否定和肯定回答（be动词的否定询问）是的，他们在。2，他们昨天在教室吗？（yesterday，classroom）Be 动词的练习1，他是医生吗？（doctor） 不，他不是。

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

1. The man isn't back.(一般现在时，单数)
2. I am not back.（一般现在时，第一人称）
3. They aren't back.（一般现在时，复数）
4. He wasn't back.（一般过去时，单数）
5. They weren't back.（一般过去时，复数）

使用be动词提问和回答

1. Is he a teacher? Yes he is. /No he isn't
2. Are you a teacher ? Yes I am. /No I am not.
3. Were they teacher? Yes They were./ No They weren't

Be 动词的练习

1，他是医生吗？（doctor）

不，他不是。

2，他们昨天在教室吗？（yesterday，classroom）

是的，他们在。

3 他们昨天不在教室。

They weren't in the classroom yesterday.