We will have done the job ahead of time if it doesn't rain.
如果不下雨，我们定能提前完成这项工作。
Most of us will have done this at some point, many of us still do.
我们很多人都在某些情况下这么做过，很多人仍然在做。
Even if they prevail, however, Mr Perez's bill will have done some good.
然而，即便他们获得了胜利，佩雷斯的法案仍将带来一些益处。