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20.2 比較and和or
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  1) 并列結構中,or通常用于否定句,and用于肯定句。


  2) 但有時and 也可用于否定句。請注意其不同特點:
   There is no air or water in the moon.
   There is no air and no water on the moon.
  在否定中并列結構用or 連接,但含有兩個否定詞的句子實際被看作是肯定結構,因此要用and。

典型例題
  ---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 表轉折。

判斷改錯:
   (錯) We will die without air and water.
   (錯) We can't live without air or water.
   (對) We will die without air or water.
   (對) We can't live without air and water.
 

















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