“连连看”——连词and，but，or用法归纳
and
◇“和”，连接两个名词，代词或两个形容词等语法作用相同的词语。

但否定句中用or。

特别提醒：如果前后名词都用no修饰，则可以用and。

（该考点不是初中内容，仅作拓展之用）
The air was so warm and bright.
It has no feet or legs.
It has no eyes and no ears.
I have no sister or brother.
◇“然后”。

用于连接两句有时间上先后的句子。

She washed the dishes and dried them.
◇表示目的，意图。

用于go, come, stop, run, stay等动词后。

Come and have a drink.
Go and buy one.
◇“只要……就会……”“如果……那么……”，用于祈使句后，表示条件与结果的关系。

Knock on the door, and it will be opened.
Come late again, and you’ll be fired.
but
◇ "但是"，“可是”，“而”，“却”。

He is in poor health, but he still keeps working.
◇用在表示歉意的话后，引起一个分句，这个but通常不译成汉语。

Excuse me, but can you tell me how to get to the railway station?
◇不与although/though (“虽然，尽管”)连用。

Though he is old, he works hard.
He is old, but he works hard.
◇作介词，表示“除了……之外”。

She did nothing but watch TV.
or
◇“一般疑问句+ or+被选择的部分”构成选择疑问句。

Do you like apples or pears?
Would you like tea or coffee?
◇“祈使句+or +陈述句”，表示“……，否则，……”
Hurry up, or you will be late.
Work hard, or you cannot pass this exam.
◇“和”，否定句中代替and。

I don’t like bananas or pears.
◇or 连接并列主语时，谓语动词的人称要与最后的那个主语保持一致。

Either you or he is right. 要么你要么他是对的。

◇or so 大约，左右
I’ll be there in an hour or so.。