Nobody has answered your question after two years; so I'm going to comment. In statement (1), Vosotros habrías vivido...is suggestive of a past action; whereas vosotros habréis is dealing with a future action Example: At the end of this year, I will have lived in California for two years, and then I will move to Ireland. Generally, the conditional perfect tense is used in "if...then" sentences like the first example in the lesson. If I had known it before, I would have worked late on that day.