regret to do 对要做的事不满。 (不做)
regret doing 对做度过的事不满、懊悔。 (已做)
I regret to have to do this, but I have no choice.
I don’t regret telling her what I thought.
—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
恢复案：D。regret having done sth. 对已突发的事感触不满。regret to do sth. 对将要做的事感触不满。本题为对已说的话感触懊悔，故此选D。
try to do 竭力，祈求做某事。
try doing 试验，试着做某事。
You must try to be more careful.
I tried gardening but didn’t succeed.
go on to do 做了壹件预，接着做另壹件事。
go on doing 持续做原到来做的事。
After he had finished his maths，he went on to do his physics.
Go on doing the other exercise after you have finished this one.
cease to do 长时间，甚到永久停做某事。
cease doing 短时停顿做某事，以后还会接着做。
That department has ceased to exist forever.
The girls ceased chatting for a moment when their teacher passed by.
mean to do 规划、想
mean doing 意味着
I mean to go, but my father would not allow me to.
To raise wage means increasing purchasing power.