although… 虽然…

even though…即使…

even if… 尽管…

虽然+某某真实情况

例句：

Although we have not yet run into poachers, it must be only a matter of time until we do.

虽然我们没有撞上偷猎者，但是如果不作出改善的话，碰到他们是迟早的事。

例句：

Even though things are going well, I often imagine what it would be like to go back into the past and teach myself what I know now.

尽管一切都在顺利的进行，我还是经常想象，如果我回到过去并且把我现在学到的东西教给那个时候的我，事情会变成什么样子。

带有很强的“假设”语气，后面跟的事情可以是已经发生的也可以是还没有发生的，虚拟不真实的。

例句：

But even if that happens, the challenge to find jobs for people who have been out of work will be the longest.

但是，即使这种事情发生，对于最长时间失业的那部分人来说，找到工作仍将是个挑战。