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，“不该……”、“要是没……”。

　　Oh, no! I shouldn't have done it. （哦，不！我要是不那样就好了。）

　　What did you do? （你干什么了？）

　　That was a mistake. （那是一个错误。）

　　I blew it. （我失败了。）

　　I wish I hadn't done that.

　　I really screwed up this time. （这次我真的给弄糟了。）

　　I really messed up. （我给搞糟了。）

　　I should have known better. （我早该弄清楚一些。）

　　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 shouldn't have said that. （我要是不说那话就好了。）

　　It's too late now. （现在后悔也晚了。）

　　I wish I wouldn't have said that.

　　我早该知道了。

　　I should have known.

　　He's married. （他已经结婚了。）

　　I should have known. （我早该知道了。）

　　I acted like a fool.

　　I should have known better. （我早该弄清楚了。）

　　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”、“粗心大意的”。

　　It was thoughtless of me to do such a thing.

　　It was hasty of me to do so.

　　I was careless. （我太粗心大意了。）

　　我后悔我做的事。

　　I regret doing that.

　　I regret doing that. （我后悔我做的事。）

　　I know what you mean. （我明白你的意思。）

　　I regret my action(s).

　　I repent my action(s).

　　I am sorry for what I have done.

　　我别无选择。

　　I had no choice.

　　Why did you drive my car? （你为什么开我的车？）

　　I had no choice. （我别无他法。）

　　I couldn't help it.

　　I had no other choice.

　　I had no choice in the matter.

　　There was nothing else I couldn't have done.

　　It was my only choice.

　　我做得太过了。

　　I went too far. *比较常用的固定短语。

　　You shouldn't have done that. （你不该那样做。）

　　I know, I went too far. （我知道，我做得太过分了。）

　　I overdid it.

　　我太紧张了。

　　I was too nervous. *也可用来辩解。

　　Did you ask her out? （你约她了吗？）

　　No, I was too nervous. （没有，我太紧张了。）

　　I was too uptight.

　　我要是再用功点就好了。

　　I wish I had studied harder.

　　I regret not studying harder. （我后悔没有更努力学习。）

　　I should have studied harder.

　　我要是问他一下就好了。

　　I should have asked him.

　　I should have asked him. （我要是问他一下就好了。）

　　Why didn't you? （那你为什么不问呢？）

　　I wish I had asked him.

　　It would have been better to have asked him.

　　不留神给忘了。

　　It slipped my mind.

　　Did you remember to tell her? （你没忘了告诉她吧？）

　　Sorry, it slipped my mind. （对不起，我不小心给忘了。）

　　I just forgot.

　　I forgot all about it. （我忘得一干二净。）