我听说过他，但是我不认识他。

I know of him, but I don't know him.

youdao

我听说过他，但还没见过他。

I've heard about him, but didn't meet him.

youdao

我听说过他，但我不知道有关他的情况。

I've heard of him, but I don't know about him.

youdao

I had this in my collection.Anybody ever heard of this?

我刚好有他的歌，有谁听说过这个歌手吗？

耶鲁公开课 - 聆听音乐课程节选

I heard he got Cs, and didn't do that great.

我听说他成绩得过C级，不是很优越。

弗兰克盖里的母校 - SpeakingMax英语口语达人