be动词的人称变化规则

回答
爱扬教育

2022-03-20

 be动词的几种形式和基本用法 :am 当主语是第一人称单数(I)时用;is 当主语是第三人称单数(he, she , it )时用 ;are 当主语是you ,we和所有复数时用 was 在过去时中,当主语是第一人称单数,第三人称单数时替换am 和is;were 在过去时中,当主语是we ,you和所有复数时用,即替换are。

扩展资料

  be动词的两种句子形式 :

  (一) 肯定形式: 主语+be+其它.

  I am (I’m) a doctor.

  2. You are (You’re) a doctor.

  3. He is (He’s ) a doctor.

  4. She is (She’s ) a doctor.

  5. It is (It’s ) a cat.

  6. This is a desk.

  7. That is a desk .

  8. We are (We’re ) doctors.

  9. You are (You’re ) doctors.

  10. They are (They’re )doctors.

  11. These are desks.   12. Those are desks.

  (二)否定句形式: 主语+ be + not+其它 (构成方法: 肯定句变否定句,只要在be 后+not 即可)   以上面的句子为例,将肯定句变为否定句.

  I am not a doctor. (注: am 和is 不能缩写 )

  2. You are not (aren’t ) a doctor.

  3. He is not (isn’t ) a doctor.

  4. She is not (isn’t ) a doctor.

  5. It is not ( isn’t ) a cat.

  6. This is not (isn’t ) a desk.

  7. That is not (isn’t ) a desk .

  8. We are not (aren’t ) doctors.

  9. You are not (aren’t ) doctors.

  10. They are not (aren’t ) doctors.

  11. These are not (aren’t ) desks.

  12. Those are not (aren’t ) desks.