I only prayed with my first grandmother, but it is so long ago, that I have forgotten.

我只和我的第一个祖母祈祷过，但那是很久以前的事了，我都忘了。

youdao

I forgot to tell you that our principal used to know you, when you were a little boy and she was a little girl, but I expect you have forgotten her, it was so long ago.

差点忘了告诉你，我们校长说，她以前见过你，当你还是一个小男孩、她还是一个小女孩的时候。

youdao

Billy: Is that you, Michael? I haven't seen you for such a long time that I have forgotten what you look like!

比利：那是你吗，迈克尔？我好长时间没有见到你了，我都忘了你长得什么样了！

youdao

And though I now sink out of view and shall be forgotten, I believe I have made some marks which will tell for the cause of civil liberty long after I have gone."

VOA: special.2009.06.11

And while I have long since forgotten how to solve a differential equation, I did learn how to drink responsibly (no tequila shots on an empty stomach).

FORBES: Grownup Training