If we do not study hard, sooner or later, we will fall behind the other students.

如果我们不努力学习，我们迟早会落后于其他同学。

youdao

If we do not drink enough water, we can get headaches, stomachaches and our kidneys will not work normally.

如果我们没有喝足够的水，我们会头痛，胃痛，肾脏也将不能正常工作。

youdao

If we do not know the facts, we are in no position to handle such matter.

不了解情况，就无从解决这类问题。

《新英汉大辞典》

If we do not act, fourteen thousand Americans will continue to lose their health insurance every single day."

VOA: special.2009.07.25

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

Now we can do more than that if we're being nerdy, but I'm not going to be this nerdy today.

如果我们再深究还能获得更多信息,不过今天就算了吧

耶鲁公开课 - 博弈论课程节选

If we do not retaliate for acts of aggression, we enter into a cycle of victimization.

FORBES: Maria Did the Right Thing - Like Any Good Negotiator Would

If we do not, British companies will continue to lose out to our global competitors.

BBC: Thameslink rail contract: Labour urges review

We feel that if we do not learn how to dance, life is not complete.

BBC: High spirits in Bali