Definition: used before you say why something did not happen or is not true Level: B1
我上周末想去看你，但我感冒了。
I wanted to visit you last weekend, ___but I caught a cold.
她没有按时提交作业，但她遇到了电脑问题。
She didn't submit the assignment on time, ___but she had computer problems.
他们希望今年夏天出国旅行，但他们负担不起。
They hoped to travel abroad this summer, ___but they couldn't afford it.
