可惜，我明天不能来参加你的派对了。

___Unfortunately, I can't come to your party tomorrow.

很遗憾，我们没买到演唱会的票。

___Unfortunately, we didn't get tickets for the concert.

不幸的是，我的自行车坏了，所以我得走路去学校。

___Unfortunately, my bike is broken, so I have to walk to school.