后悔莫及的英文：
[Literal Meaning]
repent/too late
too late to repent

[解释]
发生了以后再后悔也来不及了。

[Explanation]
too late to repent

[例子]
知道自己因为没有认真看书而考试没有及格之后，他后悔莫及。

[Example]
Knowing that he had failed in the exam because he did not review thoroughly, he knew it was too late to repent.

Marry in haste, and repent at leisure. —— John Ray
草率成婚，后悔莫及。——雷

The road to hell is paved with good intentions
徒有良好的愿望而不去努力实现,后悔莫及

I was overcome with remorse.
我后悔莫及。

It was too late to repent my mistakes.
我对自己犯的错误后悔莫及。

But we both wanted help, and now i found more than before, i had done wrong in parting with my boy Xury.
然而,我们都感到缺乏劳动力。这时,我想到真不该把佐立让给别人,以致现在后悔莫及。