regret to do 對要做的事遺憾.(未做)
regret doing 對做過的事遺憾、后悔.(已做)
I regret to have to do this,but I have no choice.
我很遺憾必須這樣去做,我實在沒有辦法.
I don't regret telling her what I thought.
我不為告訴她我的想法而后悔.
典型例題
---You were brave enough to raise objections at the meeting.
---Well,now I regret ___ that.
A.to do B.to be doing C.to have done D.having done
答案：D.regret having done sth.對已發(fā)生的事感到遺憾.regret to do sth.對將要做的事感到遺憾.本題為對已說的話感到后悔,因此選D.