Definition: used before you say why something will not or did not happen or is not true Level: B1
我本打算去他的派对，但我生病了。
I was going to go to his party, ___but I was ill.
很抱歉这么久没写信，但我上周非常忙。
I'm really sorry I haven't written for so long, ___but I was very busy last week.
他计划去徒步，但下了一整天的雨。
He planned to go hiking, ___but it rained all day.
