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带你步入魔法世界:《哈利•波特与魔法石》赏析(76)

时间:2012-02-16 11:02:45 来源:可可英语 编辑:lily  每天三分钟英语轻松学

once的用法总结

1. once用作连词时,意为“一旦……就……”,用于连接时间状语从句,相当于as soon as。
如:     
Once you start, you will never give up. 一旦你开始了,你就不要放弃。      
   
注意:once引导的是时间状语从句,从句要用一般现在时代替将来时。 
   
2. once用作副词时,意为“曾经;一度;从前”。它是一个不确定的时间副词,其位置一般是在行为动词之前,系动词之后。
如: 
Once he lived in America, but now he lives in England.他曾经生活在美国,但现在他生活在英国。 
   
3. once用作副词,也可意为“一次”的意思。两次是“twice”,三次是“three times”,四次是“four times”。 

The old professor comes to see us once a week.那个老教授一周来看我们一次。 
   
4. 注意once用作副词时,在句中的位置不同表示的意思也不同,所以要特别注意。
如:
I once went to Shanghai. 我曾经去过上海。    
I went to Shanghai once. 我去过上海一次。 

关于hear about 与 hear of
 
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?

hear + sth / 宾语从句: 听说或得知(某事物):
Do you hear the sound? 你听到声音吗?
I heard (that) Tom would leave here. 我听说Tom会离开这里.
注意: 上句是宾语从句,当that在宾语从句中作连词引导从句时,that可省略。

hear of + sb./sth: 听到或知道某人[某事物]的情况

I have never heard of him since he left. 自从他离开后,我再没听到过他的消息。
I have heard of the song. 我曾听说过这首歌。(注意:这里提及的不是听到这首歌,而是听说过这首歌)

hear about + sth. : 听到关於某事物的消息
I've just heard about his promotion. 我刚刚听到了他被提升的事。 

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