Be动词的否定
在 am, is, are, was, were后面加not。
缩略：am not, isn't, aren't wasn't, weren't
- The man isn't back
- I am not back.
- They aren't back.
- He wasn't back.
- 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
- 他是医生吗
Is he a doctor. No, he isn't. - 他们昨天在教室吗
Were they in the classroom yesterday?
Yes,they were. - 他们昨天不在教室
They weren't in the classroom yesterday.