问题描述: the students are cleaning the classroom.(改一般疑问句并否定回答)要写出原因! 1个回答 分类:英语 2014-10-18 问题解答: 我来补答 Are the students cleaning the classroom NO,they aren't 一般疑问句有be动词则提到句首 无则用助动词 展开全文阅读