如果我们

if not───如果不；不然的话

If we leave now, I can catch the earlier flight.───我们要是现在动身，我就可以赶上早一点的航班。

If we don't make a profit, my job is on the line.───我们要是赚不了钱，我就有失业的危险。

If we all agree, let's wind up the discussion.───如果我们大家都同意，咱们就结束讨论吧。

We always have time enough, if we will but use it aright. 

We shall never have friends if we expect to find them without fault. 

If we pull together, success is certain.

We only live once, but if we work it right once is enough. 

We'll be left behind if we loiter.

If we are bound to forgive an enemy, we are not bound to trust him. Thomas Fuller 

We'll call you if we find it.

If we cannot get what we like, we have to like what we can get. 

If we only had some God in the country's laws, instead of beng in such a sweat to get him into the Constitution, it would be better all around.