1. I'm sorry to bring up my resignation at this moment.
我很抱歉在這個時候提出辭呈。
還能這樣說：
I'm sorry to submit my resignation at this moment.
I feel bad to resign at this moment.
應用解析：
the moment (that...) (=as soon as) 一……就……；
moment of truth （接受考驗）關鍵時刻

2. I feel very sorry, could you let me resign?
很抱歉，您能不能批準我辭職？
還能這樣說：
I'm very sorry, I'd like to resign.
I feel very sorry. Could you give me permission to resign?
應用解析：
resign oneself to extinction 束手待斃；
not resign oneself to 不甘心

3. I've made a tough decision. Here is my resignation.
我做了一個很困難的決定。這是我的辭呈。
還能這樣說：
It's a tough decision to quit this job. It's my resignation.
I've made a tough decision to quit this job. Here is my resignation.
應用解析：
act with decision 斷然行動；
hand down a decision 作出判斷

4. I want to resign my position as manager.
我想辭去經理的職位。
還能這樣說：
I want to quit my position as manager.
I'd like to resign my position as manager.
應用解析：
take up the position 主張