hear通常表示某种声音“进入我们的耳朵”.是听到、听见的意思,但不一定指有意识地听.
e.g.Suddenly I heard a strange noise.
我突然听到一种奇怪的响声.
e.g.Can u hear me?
你能听到我的话吗?
2.listen (to)用来表示注意正在持续发出的声音.这个词强调集中注意力,想尽量听清楚.你即使不想听,也能hear某个声音.但你只能有意识地listen to某个声音.试比较：
e.g.I heard them talking in the next room,but I didn't really listen to what they were saying.
我听见他们在隔壁房间里谈话,但我实在没有去听他们在说什么.
e.g.Listen very carefully,please.
请注意听.
e.g.Could u speak a bit louder?I can't hear u very well.
请把声音放大些,我听不太清楚.
e.g.I didn't hear the phone because I was listening to the radio.
我没有听见电话响,因为我在听收音机.
3.listen (to)主要是用来表示正在听.如果要表示从头到尾听完一次演出、演说、音乐节目、广播等,一般要用hear.试比较：
e.g.When she arrived,I was listening to a record of Brendel playing Beethoven.
她来的时候,我正在听唱片,布伦德尔演奏的贝多芬.
（不能说I was hearing...）
e.g.I once heard Brendel play all the Beethoven concertos.
有一次,我听了布伦德尔演奏贝多芬全部的协奏曲.
（不能说I once listened to Brendel play...）
e.g.I wish I had more time to listen to the radio.
我真希望能有更多的时间听听收音机.
（不能说to hear the radio）
4.hear通常不用于进行式.要讲说话时听到什么,常用can hear,尤其在英国英语中
e.g.I can hear somebody coming.
我听见有人来了.（不能说I am hearing）
