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20.2 比较and和or

 

 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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