I am sorry to inform you that...

我很抱歉地通知您。

youdao

I am sorry to inform you that he can not come to the meeting.

非常报歉地通知你他不能来开会了。

youdao

I am terribly sorry to inform you that I have to cancel our appointment.

我十分抱歉告诉你我得取消我们的约会。

youdao

I am terribly sorry to inform you that I have to cancel our appointment.

我十分抱歉告诉你我得取消我们的约会。

youdao