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. |