Every Sunday,children are having classes in the classroom when(while) the genearch are waiting them out the classroom .
我怎么觉的用while好一些
when连接的前后两各动作是不连续的,而while是连续的．就本句来说”孩子们在教室里上课,家长在外面等着”应都是两个连续的动作．
如果非要用When,就把When前后都该为一般时态