I often hear her sing this song
问题描述:
I often hear her sing this song
sing不用第三人称单数吗?为什么不是时间是I often hear her sings this song
答
hear sb.do sth.听到某人经常做某事
如果用sings的话,这句话就有两个谓语动词了,肯定不对的.