I often hear her sing.
我常听到她唱歌。
She is often heard to sing.
I often hear her sing.
I often hear her singing.
I have heard of the hero through the press.
我曾在报刊上读到过这个英雄。
I hear from him every week.
I have not heard from England for several months.
I have heard from your father that you are in Beijing.
I have often heard you spoken of as a model student.
You can hear something without wanting to, but you can only listen to something deliberately.