the two students -----------when the teacher came in 为什么填 were seen fighting 是什么句型呀
问题描述：
the two students -----------when the teacher came in 为什么填 were seen fighting 是什么句型呀
答
是被动句.be seen doing 被看见正在做.
翻译：当老师进来的时候,这两个学生被发现正在斗殴.
The two students（主语） were seen fighting（谓语） when the teacher came in（时间状语从句） .