有些事情我本应该去做，我却没去做，我永远无法原谅自己。

sth that i would have done,but i have not,ican not forgive myself forever,forever!

There were some things which I should had done, but I had not.
I will never forgive myself for this.

There were something i should have done,but i haven't , I can't forgive myself forver .

There was something I should have done but I did not. I would never forgave myself forever.

something that i should do,but i didn't do it,i won't forgive myself forever.