l heard a girl singing in the next room.改为宾语从句
问题描述：
l heard a girl singing in the next room.改为宾语从句
答
I heard that a girl was singing in the next room.
答
l heard that a girl was singing in the next room.
hear sb doing sth=hear (that) sb are/were/is/was doing sth
祝你进步
答
I heard that a girl was singing in the next room.
很高兴为你解答!
老师祝你学习进步!
望采纳,多谢你的问题!^_^