regret not to

I regret not to have started earlier与I regret not having sta 是不是只有regret not doing sth.而没有regret not to do sth. regret not to do sth和regret doing是否可以替换 he regret（ ）my advice.a.not having b.not take c.to have not I regret _ your advice.A.not taken B.not to take C.not takin 'm not regret this time ,you have to remember It's not my fa I regret ____ harder at school.A.not to have worked B.not ha I'm not regret this time ,you have to remember It's not my f I regret to you that I can not travel to beijing together wi much to our regret we will not be able to visit your next ye I regret to say it is not always easy to do the right thing. I regret to say that I am not in a position to comply with y