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。
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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。