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.