题目内容：

有没有be heard doing的说法
看一个例句：he is heard to sing now./he was heard to sing just now 这里为什么用sing,我想都是短暂的动作不应该用singsing吗?

优质解答

有be heard doing 的用法.请看例句：1.I often hear him sing in the morning.(改为被动语态）(我经常听到他早晨唱歌,hear sb.do sth.）He is ofen heard to sing in the morning.2.I heard him singing just now.(...