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.