If not, we couldn't put money in the bank, buy food, clothing, or medicine from others, drive across a bridge, get on a plane—the list is endless.

如果不是，我们就不能把钱存入银行；不能从别人那里购买食物、衣服或药品；不能开车过桥，不能坐飞机——这样的事情不胜枚举。

youdao

If that worked, we should say hooray! If not, we will soldier on to the next step.

如果成功了，我们应该说万岁！如果没有，我们将坚持到下一步。

youdao

If not, we surely must find the owner, for he will certainly miss it.

否则，我们一定要找到它的主人，因为他一定会找不到它的。

youdao

We are not sure if Muhammad means the favorite sport to watch or to play so we will include both.

VOA: special.2010.01.29

If not we're gonna call in some help.

如果还没好，那我们就得找人帮忙了。

哈佛公开课 - 计算机科学课程节选

We're not being merely churlish, I think, if we want to ask why someone would want to write a poem in such a form.

我们要问为什么会有人,想要写这种形式的诗并非毫无道理。

耶鲁公开课 - 弥尔顿课程节选

If not we need to ask if they are still of use.

BBC: NEWS | UK | Magazine | On your marks

We are not taking the threat seriously if we do not answer basic questions about it and if we do not take the time to speak clearly and precisely when articulating it.

FORBES: Just How Big Is The Cyber Threat To The Department Of Defense?

We will not do it if we do not put in place extraordinary measures - large catch-up campaigns.

BBC: Threat to measles elimination plans