u are a boy. • →You aren′t a boy. • → Are you a boy?↑ Yes, I am. (肯定回答不能缩写.) No, I′m not.
• 2. It is a green ruler. → It isn′t a green ruler. →Is it a green ruler?↑ Yes, it is. No, it isn′t.
人教版七年级英语上册知识点
be动词用法(一般现在时态)
宣威市文兴乡一中 徐玉娥
1.运用口诀：
我用am， 你用are， is跟着他(he)她(she)它(it)， 单数用is， 复数用are.
用法演示：
1. I am a girl. 2. You are a teacher. 3. He is my father. 4. She is fine. 5. It is a ruler. 6. His pen is red. 7.My cat is nice. 8. We are friends. 9. They are good boys.
• 3. I’m a good student. →I′m not a good student. →Are you a good student? (变为一般疑问句时第一人称换为第二 人称) Yes, I am.(肯定回答不能缩写.) No, I′m not.
• 4. This is my key. →This isn′t my key. →Is this your key?↑ Yes, it is.(肯定回答不能缩写.) No, it isn′t. 注：以this,that 作主语的问句，回答用Yes, it is. No, it isn′t. 而以these, those作主语 的问句，回答用Yes, they are. No, they aren′t.
• 4. This is my key. →This isn′t my key. →Is this your key?↑ Yes, it is.(肯定回答不能缩写.) No, it isn′t. 注：以this,that 作主语的问句，回答用Yes, it is. No, it isn′t. 而以these, those作主语 的问句，回答用Yes, they are. No, they aren′t.
2.句型转换：
• 否定句： 在be动词am,is,are后加not,并作相应的 缩写为 amn′t, isn′t, aren′t. • 一般疑问句： 把be动词 am, is, are提到句首，大写 首字母,句末加问号，读为升调↑. 肯定回答用: Yes, 主语+ am /is /are. 否定回答用: No, 主语+amn′t / isn′t /aren′t.