Be 動詞的否定

在is ,? am , are , was , were 后面加not.

縮略式?isn't ,? am not , aren't , wasn't , weren't?.

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動詞提問和回答

- 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 ?

Yes, they were / No, they weren't

Be動詞的練習(xí)

1.他是醫(yī)生嗎？（doctor）

Is he a doctor ?

Yes, he is? / No，he isn't.

2.他們昨天在教師嗎？（yesterday , classroom ）

Were they in the classroom yesterday?

Yes they were. / No, they weren't

3.他們昨天不在教室。

They weren't in the classroom yesterday.