It is a pity that…

It is a pity that I couldn’t go with you.

很遗憾，我不能和你一起走。

It is a pity that your mother is ill.

很遗憾，你妈妈病了。

It is a pity that you couldn’t catch the train.

很遗憾，你没能赶上火车。

功能：在别人遇到不顺心的事情的时候用这个句型，是很好的安慰方式。