he was heard singing=he was heard to sing?
问题描述:
he was heard singing=he was heard to sing?
dictionary tells us like this,
I don't know why
答
I am good at English.Let me tell you why:hear这样的词有两种结构,hear sb doing sth或 hear sb do sth he was heard singing=he was heard to sing?这两种说法都对,分别是上面两者的被动形式...