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 1) 并列结构中,or通常用于否定句,and用于肯定句。 
 
 2) 但有时and 也可用于否定句。请注意其不同特点: 
   There is no air or water in the moon. 
   There is no air and no water on the moon. 
 在否定中并列结构用or 连接,但含有两个否定词的句子实际被看作是肯定结构,因此要用and。 
 
典型例题 
 ---I don't like chicken ___ fish.  
 ---I don't like chicken, ___ I like fish very much. 
 A. and; and  B. and; but C. or; but D. or;and 
 答案C。否定句中表并列用or, but 表转折。 
 
判断改错: 
  (错) We will die without air and water. 
  (错) We can't live without air or water. 
  (对) We will die without air or water. 
  (对) We can't live without air and water. |   
 
 
                    
                     
 
 
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