你不能再多停留些時間，真是遺憾。
It's a pity that you can't stay longer.
我很遺憾，他不接受那項工作。
He didn't accept the job, I'm sorry to say.
我只能遺憾地告訴你，你不及格。
I'm sorry to have to tell you you've failed.
我很遺憾美國也附和了這樣的抗議。
I regret that the United States has added its voice to such protests.