and與or

于曉嬌

1.并列結(jié)構(gòu)中,or通常用于否定句,and用于肯定句。但有時(shí)and 也可用于否定句。請(qǐng)注意其不同特點(diǎn):

There is no air or water in the moon.

There is no air and no water in the moon.

2.在否定句中,并列結(jié)構(gòu)用or 連接,但含有兩個(gè)否定詞的句子實(shí)際被看做是肯定結(jié)構(gòu),因此要用and連接。

典型例題:

—I dont like chicken ___ fish.

—I dont like chicken, ___ I like fish very much.

A. and; and B. and; butC. or; butD. or;and

答案C。否定句中表并列用or, but 表轉(zhuǎn)折。

判斷對(duì)錯(cuò):

We will die without air and water. (錯(cuò))

We cant live without air or water. (錯(cuò))

We will die without air or water. (對(duì))

We cant live without air and water.(對(duì))