If you don't do it now, you'll only regret it.

你如果现在不做，以后一定会后悔的。

《牛津词典》

I used to take work home, but I don't do it any more.

我过去常把工作带回家，但现在再也不那样做了。

《柯林斯英汉双解大词典》

If you don't do it soon you're going to lose the opportunity.

如果你不尽快做，你会失去机会的。

《柯林斯英汉双解大词典》

"If we can bring some smile on people's faces - even if we don't do it exactly like it was done before - if they like it, that makes us happy."

VOA: standard.2010.05.28

Because you will come to regret it if you don't do it. But we're not going to grade it.

但是我们不会对此计分,因为不计分所以让你们。

麻省理工公开课 - 计算机科学及编程导论课程节选

that they do it because they want to do it. They don't do it for me.

她们做什么是因为她们喜欢做。她们不是为我做。

学习靠自觉 - SpeakingMax英语口语达人

"If you don't have to get out, just really, please, don't do it, " Brownback said.

NPR: Winter Storm Blankets Great Plains With Snow

Some people say, well, don't do it right now because the economy is weak.

WHITEHOUSE: Fighting for Health Insurance Reform

It was their way or you don't do it, and it will be the same with Alan.

BBC: Alan Hansen's column