你不能再多停留些时间，真是遗憾。
It's a pity that you can't stay longer.
我很遗憾，他不接受那项工作。
He didn't accept the job, I'm sorry to say.
我只能遗憾地告诉你，你不及格。
I'm sorry to have to tell you you've failed.
我很遗憾美国也附和了这样的抗议。
I regret that the United States has added its voice to such protests.