hear sb doing sth 与hear sb to do sth有什么区别
问题描述：
hear sb doing sth 与hear sb to do sth有什么区别
答
错了
hear sb.doing 是听见某人正在做某事
Iheard someone singing in the classroom我听到教室里有人在唱歌
hear sb.do sth 听见某人做了某事,
I heard someone sing ...我听见有人唱了一首歌.