定义 / 说明
在 Present Continuous 中构成否定句时，把 not 放在 am/is/are 后。构成疑问句时，把 am/is/are 提到主语前。无论是否定还是疑问，主句动词都保持 -ing 形式。这个结构可用于询问“现在是否正在发生某事”或说明“现在没有发生某事”。缩写形式 isn't 和 aren't 在日常英语中非常常见。
关键规则
- 否定形式：I am not working, he is not working, they are not working。
- 常用缩写：isn't, aren't。
- 疑问形式：Are you working? / Is she coming?
- 疑问句中将 am/is/are 放在主语前。
- 使用简短回答：Yes, I am. / No, he isn't.
例句
- Are you waiting for me? - 你在等我吗？
- Is he listening to the teacher? - 他在听老师讲课吗？
- I am not wearing a jacket. - 我没穿夹克。
- She isn't coming today. - 她今天不来。
- Are they staying here tonight? - 他们今晚住这里吗？
常见错误
- ❌ You are waiting for me? -> ✅ Are you waiting for me?
- ❌ He not is listening. -> ✅ He isn't listening.
- ❌ I am not wear a jacket. -> ✅ I am not wearing a jacket.