listen to,hear,hearof,hear from的区别

（百度怎么还有这个功能?）listen to 是动作“听”hear 也是听,但是更强调听到的结果例如：I listened carefully to the radio,but didn't hear anything。我仔细听收音机,但是什么也没听见。(这个句子很烂)hear of 是听说到I have never heard of the anecdote before。我从来也没有听到过这件事。hear from 有从。。。听说到,收到。。。消息等意思I am delighted to hear from you。收到你的来信很高兴。