Be动词的形式 ：现在：be, is, am, are, 过去：was, were, 现在分词：being, 过去分词：been; 1. The man is back. 2. They are back. 3. He was back. 4. They were back. 5. They have been back. (备注：现在完成时) Be动词
- Be动词的形式：现在：be, is, am, are, 过去：was, were, 现在分词：being, 过去分词：been;
1. The man is back.
2. They are back.
3. He was back.
4. They were back.
5. They have been back. (备注：现在完成时)
- Be动词的用法：后面接名词，形容词，地点副词或短语作补足语；
1. The man is a teacher;
2. Mary`s new dresses are colorful;
3. My mother was in the kitchen;
- Be动词的否定/ 提问/ 回答
be动词的否定：在am, is, are, was, were 后面加 not，缩略式：am not, isn`t, 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 teacher? -- Yes, they were. / No, they weren`t;
[说明：提问时be动词前置]
该笔记整理于崔荣容老师的视频讲解：https://www.bilibili.com/video/av2639206