They are singing in the classroom.对are singing 提问

They are singing in the classroom.对"are singing"提问 They are singing in the classroom.对are singing 提问 They are singing(in the classroom.)对打括号部分提问 The birds are singing in the tree.对singing提问 英语题;they are singing in the classroom改为否定句,对in the classroom they()in the classroom now A sing B are singing （1） Some students are in the classroom.They are singing （合并一 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ar 改为一般疑问句：The students are singing in the classroom? Some girls are singing in the classroom What_____the girls__ Susan is singing in the classroom.对singing提问 Frank never see They are in the classsroom,对in the classroom提问