题目内容：

He has lunch with his classmates at school改为否定句
请注明为什么，谢谢

优质解答

He doesn't have lunch with his classmates at school.

追问：

为什么？

追答：

has 是第三人称单数，否定句用助动词does +not ，缩写为doesn't ，然后将动词has 还原成have 。