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.
　　短对话 　　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?
　　 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.
　　短对话 　　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。
[图片0] 　　3 should have known.我早该知道了。 　　I should have acted like a fool. 　　I should have known better.
　　短对话 　　A:He's married.他已经结婚了。 　　B:I should have known.我早该知道了。
　　 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.
　　情景对话 　　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。