egret to do sth.很遗憾地／抱歉地做...（事情还没有做） I regret to tell you that you can't pass the examination.我很遗憾地通知你你不能通过这次考试． regret doing sth.很遗憾/后悔做了...（为已经做过的事而感到...） I regret disturbing yo so long.我很抱歉打扰了你那么久．
regret to do 遗憾，后悔要去做的事 regret doing 后悔已经做了的事 相同的： remember to do 表将来 remember doing 表过去 forget to do forget doing eg.I forget to close the windows.我忘关窗户了。 I forget closing the windows.我忘记已经关了窗户了。
regret to do 对要做的事遗憾。 (未做) regret doing 对做过的事遗憾、后悔。 (已做) I regret to have to do this, but I have no choice. 我很遗憾必须这样去做，我实在没有办法。 I don't regret telling her what I thought.
