She heard someone was singing（改为简单句）
问题描述：
She heard someone was singing（改为简单句）
答
She heard someone singing
去掉从句中的are 即可
如果帮到你，请记得采纳，O(∩_∩)O谢谢
答
She heard someone singing.
hear sb doing sth 听见某人正在做 某事