问题描述: They are singing in the classroom怎样改成否定句、一般疑问句、肯定回答、否定回答、对are singing提问 1个回答 分类:英语 2014-10-11 问题解答: 我来补答 否定They are not singing in the classroom疑问 are they singing in the classroomyes,They are no,They aren'twhat are they doing 展开全文阅读