Why don't you get off my back! I'm doing my best.

你别再数落我了行不行？我正尽力而为。

Get off my back, will ya? I'll do it when I have time.

别罗嗦了，好不好？我有时间就去做。

Why don't you get off my back? You've been bitching at me all night.

你为何不让我一个人安静一下?你整个晚上都在抱怨我。

A: why don't you get off my back? you've been bitching at me all night.

你为何不让我一个人安静一下？你整个晚上都在抱怨我。