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1.I houldn" t have done it.我真不该那样做。I shouldn"t have done it.　　用"shouldn" t have+过去分词“表示类似责备或斥责的心情，表示“不该……”、“要是没……”。　　That was a mistake./I blew it./I wish I hadn"t done that.　　I really screwed up this time./I really messed up.　　I should have known better.　　A:Oh, no!I shouldn"t have done it.哦，不!我要是不那样就好了。　　B:What did you do?你干什么了?2.I houldn" t have said that.我要是不说那话就好了.I shouldn"t have said that.　　用于说了不该说的话时。　　I wish I wouldn"t have said that.　　A:I shouldn"t have said that.我要是不说那话就好了。　　B:It"s too late now.现在后悔也晚了。3 should have known.我早该知道了。I should have known.I acted like a fool.　　I should have known better.A:He"s married.他已经结婚了。　　B:I should have known.我早该知道了。4.It was careless of me to do so.做那种事，我也太不小心了。It was careless of me to do so.　　careless表示“没注意的”、“漫不经心的”、“粗自大意的”。　　It was thoughtless of me to do such a thing.　　It was hasty of me to do so./I was careless.5. regret doing that.我后悔我做的事。I regret doing that./I regret my action.　　I am sorry for what I have done.　　A:I regret I haven"t taken your advice.我后悔没有采纳你的建议。　　B:What"s the matter?发生什么事了?　　A:Yesterday I came here to buy lottery and you suggested me choose three as the last number.昨天我来这里买彩票，你建议我后一个号码买3。　　B:Yes.是的。　　A:If I had listened to you, I would have got the highest price.如果我听了你的话，我就已经获得高奖金了。　　B:Thus I"m regretful too.那么我也后悔了。　　A:Why?为什么?　　B: I should buy that number myself.我自己也应该买那个号码。　　A:I regret doing that.我后悔我做的事。　　B:I know what you mean.我明白你的意思。