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高考英语重点词法击破：can 1.表能力，在肯定句中指过去做某事的能力，泛指一般能力用could,只表具备做某事的能力，但并不表明是否干成。如：If I could plan to do anything I wanted to, I’d like to go to Tibet and travel through as much of it as possible. 2.表懊悔、遗憾，could have done表过去未曾实现的动作，即本能够干好的事却没干好。如：He paid for a seat, when he could have entered free. I could have finished the job in the given time but the computer didn’t work. 3.表惊讶等感情色彩，仅用于疑问句、否定句和感叹句中。如： How can you say that you really understand the whole story if you have covered only part of the article? 4.表推测，常不用于肯定句中，若用于肯定句中则表偶尔一时的特征，译作“有时会”；而can’t表不可能。如： The World Wide Web is sometimes jokingly called the World Wide Wait because it can be very slow. -----Isn’t that Ann’s husband over there? -----No, it can’t be him. I’m sure he doesn’t wear glasses. 5.表许可，在请求对方许可时，can 在口语中常用；在准许对方做某事时，答语用can,不用could。如：A left-luggage office is a place where bags can be left for a short time, especially at a railway station. | 
