Be 动词的否定
在is , am , are , was , were 后面加not.
缩略式 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动词提问和回答
- 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动词的练习
1.他是医生吗？（doctor）
Is he a doctor ?
Yes, he is / No，he isn't.
2.他们昨天在教师吗？（yesterday , classroom ）
Were they in the classroom yesterday?
Yes they were. / No, they weren't
3.他们昨天不在教室。
They weren't in the classroom yesterday.
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