Is this game played by young people? 希望我的回答能够帮到您,祝学习进步! (*^__^*) 再问： 那When do the students clean the classroom?怎么改？ 是不是When the students are done clean the classroom? 再答： 改为被动语态吗？应该是： When is the classroom cleaned by the students? 再问： 能不能总结一下如何改被动语态？和将被动语态改为主动语态？简单一些，要通用的。 再答： http://wenku.baidu.com/view/67121f6448d7c1c708a1457d.html 一言难尽，建议在百度上搜索一下！OK？ 再问： 看不成。
