1.hear of 2.hear about 3.hear from sb

1.They had often heard of elephants,but they had never seen one.他们常常听说过大象，但是从来没有见到过。
I have never heard of such a man.我从未听说过这样的一个人。
2.I often hear about her .我听说过她。
Do you hear about the news?你听说那个新闻了么？
3.Have you heard from your brother?你收到你哥哥的信了么？
I heard from him every month.
我每月都收到他的信。

I heard of a story about the bird.
I heard of him.
I heard about the school.
He heard about the teacher.
I heard from him.
She heard from her dad.

I have heard a lot about you. 久仰大名。
I just heard of your resignation. 我刚刚听说你辞职了
I have not heard from him for ages! 我很久没有收到她的信了