题目内容：

I often hear the girl sing beautiful songs 改为被动语态怎么改

优质解答

The girl is often heard to sing beautiful songs (by me).


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追问：

能解释一下为什么么

追答：

hear sb do sth
被动式：
be heard to do sth

不定式在hear, notice, feel , watch see 等感官动词的被动式后面做主补时， to 不能省略