我要是不说那话就好了。I shouldn't have said that.
-It's too late now.
-I wish I wouldn't have said that.
我早该知道了。I should have known.
-He's married.
-I should have known.
-I acted like a fool.
-I should have known better.
做那种事，我也太不小心了。It was careless of me to do so.
-It was thoughtless of me to do such a thing.
-It was hasty of me to do so.
-I was careless.
我后悔我做的事。I regret doing that
-I regret doing that.
-I know what you mean.
-I regret 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?
-I had no choice.
我做得太过了。I went too far.
-You shouldn't have done that.
-I know, I went too far.
我太紧张了。I was too nervous.
-Did you ask her out?
-No, I was too nervous.
-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.
-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.
-Why didn't you?
-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?
-Sorry, it slipped my mind.
-I forgot all about it.