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
1个回答 分类:英语 2014-10-08

问题解答:

我来补答
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
 
 
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