1. hear可用作及物动词，表示“听到”、“听见”，侧重于听的结果。
如：
I often hear Lucy sing in the next room. 我经常听见露西在隔壁房间唱歌。
I'm very sorry to hear that. 听到那件事我非常难过。
Hear后面还可以跟that从句，
如：
I hear that you've been here for several years. 我听说你已经来这儿几年了。
2. hear of是“不及物动词+介词”构成的词组，意指间接地“听到”“听说”后接名词性质的词。
如：
I have never heard of him before. 我以前从来没有听说过他。
注意：hear of与hear about的意义相近，这两个词组在英语中有时可以通用。它们含有“听人说起”，“从书报上看到关于”等意义。例如：
I’ve never heard of him. 我从来没有听说过他。
Have you heard about him from anywhere? 你从什么地方听到过他吗？
3. hear from指“收到……的来信”与get or receive a letter from 同义，其宾语应是人，而不是信。
如：
I often hear from my parents. 我经常收到父母的来信。
Hope to hear from you soon. 希望你早点来信。
We have not heard from him since he left. 自从他离开后，我们一直没有收到他的来信。
