and和or的用法

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and和or的用法

and和or的用法
and和or的用法

and和or的用法
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.

and 一般用在肯定句。or用于否定和疑问句。

and意思是‘和’,表示‘加起来’
例: you and me(我和你)
or意思是‘或者’,表示选择。
例:red or yellow?(红色还是黄色?)