过去我们曾经认为有些不可数名词可转化为可数名词,其实,那并不是“转化”的问题,而是这个名词本身就兼有不可数和可数两种属性,而这两种属性下,其词义自然就有不同。 
  例:Every year the school consumes lots of ____ to print examination _______. 
  A. paper; papers  
  B. paper; paper  
  C. papers; papers  
  D papers; paper 
  答案A。paper做不可数名词是“纸张”的意思,而做可数名词是“试卷、报纸、文件”的意思。 
  因此,识记名词首先要看分类属性,然后再记词义。在理解和把握名词的“数”时,还要注意下面几个问题: 
  1.“绝对的”不可数名词 
  英语中,有些不可数名词,如:fun,progress等,是“从一而终”的,也就是说,在任何情况下都不能用不定冠词(a/an)和数词限定。 
  例一:_____ fun it is to jump into a pool or go swimming in summer!  
  A. What a B. How 
  C. How a D. What  
  答案D。本题容易误选A。 
  例二:But back then, it was a huge ____ , especially when compared with the car mobile phones that had been in use since the 1940s. 
  A. progress B. mistake 
  C. advancement D. failure 
  答案C。本题容易误选A。 
  2.具体化了的不可数名词 
  属于不可数名词的有些抽象名词,可以具体化。这时,它的前面要用不定冠词修饰。如: 
  rain(雨)一a heavy rain(一场大雨), 
  swim(游泳)一have a swim(去游泳) 
  knowledge(知识)一a good knowledge of French(对法语很好的了解和熟悉) 
  例 Many people agree that ___ knowledge of English is a must in ___ international trade today. 
  A.a; / B.the; an  
  C.the; the D./; the 
  答案A。作为抽象名词的knowledge,在这里表示“知道;熟悉”,被具体化了。 
  3.名词身有两性,即兼有可数和不可数性 
  英语里有很多名词既可以是可数的,又可以是不可数的。有时意思相近,但更多的是语义大相径庭。 
  例一:The teacher asked his students to help the old lady to do some housework and they made a good _____ of it. 
  A. job B. work  
  C. task D. justice 
  答案A。本题容易误选B。work当“工作”“活儿”讲时,是不可数名词,不能用不定冠词来限定。 
  例二:He gained his______ by printing _______of famous writers. 
  A.wealth; work  
  B.wealths; works  
  C.wealths; work  
  D.wealth; works 
  答案D。wealth 指“财富”,是不可数名词;复数形式的works,指文学、艺术作品。 
  例三:Mr. Johnson used to work in the ___ department of the chemical ____. 
  A. sale; work  
  B. sales; work 
  C. sales; works  
  D. sale; works 
  答案C。复数形式的works可以指工厂(factory)。the chemical works指化工厂。 
  例四:____ came that they had ___ with each other for the property division. 
  A. Words; word  
  B. Word; word  
  C. Word; words  
  D. Words; words 
  答案C。不可数形式的word指的是“消息”,而可数的word的复数形式在这里指“争吵”。  
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