但是用英语可以表达为but，whereas，yet，however和nonetheless等。

例句：
但是，全面成本核算马上将被采用。

But full cost accounting will be introduced without delay. 

这些学校相邻，但是有各自的门。

The schools were adjacent but there were separate doors. 

他请求她嫁给他，但是她回绝了。

He asked her to marry him but she turned him down. 

对不起，但是我得马上走。

I'm sorry, but I must go now. 

物价上涨了，但是工资并没有相应增加。

Prices have risen but wages have not risen proportionately. 

她应该在8:30到这里，但是没有到。
She was to be here at 8.30 but she didn't arrive.