I re GREt not studying harder.

我后悔没有更努力学习。

I re GREt this quality problem.

对质量问题我深表遗憾。

Wee note with re GREt that……

我们遗憾地注意到䱚……

I really re GREt it.

我真的非常后悔。

"You'll never re GREt it," I say finally.

“你永远不会后悔，”我最后说。