I heard Amy singing in the next room just now怎么改被动语态?

I heard Amy singing in the next room just now怎么改被动语态? 将I heard Amy singing in the next room just now.改成被动语态Amy __________ ____________ ____________ in the next door by_____ just now. I heard Amy singing in the next room just now.(改为被动语态)Amy ( )( )( )in the next room by ( )just now.急用!PLEASE! I heard him singing there改被动句是heard singing还是heard to sing I heard he is singing.是病句么?能不能改为I heard that he is singing. I singing someone doing heard my honework while was I I heard someone is singing.(改为简单句) I heard him singing改为被动语态which is correct?then I heard him sing? i heard her singing.i heard her sing.有什么不同啊? I heard a girl singing in the next room heard 和 singing在句中用法和原因 为什么这里不要还原to?I heard the boy singing just now.The boy was heard singing just now. I heard the girl singing a song,为什么是用heard I heard them sing in the classroom.是对的,为什么I heard them singing in the classroom.不对?正在唱歌不应该用singing吗? just now I heard students 【singing】in the classroom .为什么用singing,而不用sing?just now I heard students 【singing】in the classroom .为什么用singing,而不用sing? I heard him singing when I pass his room.改被动（主语为he） I,passed,heard,her,when,I,singing,by.(连词成句） when I walk p__ his room,I heard him singing.填什么 he was heard singing=he was heard to sing?dictionary tells us like this,I don't know why