你好否定句:I was not a pupil three years ago. 三年前我还不是个小学生。一般疑问句:Were you a pupil three years ago? 三年前你是小学生吗?肯定回答:Yes, I was. 是的,我是。否定回答:No, I wasn't 不,不是。保证准确率~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~祝你学习进步,更上一层楼!不明白请及时追问,满意敬请采纳,O(∩_∩)O谢谢~~