That five-word story may beat this, the "shortest novel":
For Sale: Baby shoes, never worn.
I found a really clear short video lesson for past conditional on the following link: http://www.tolearnfrench.com/exercises/exercise-french-2/exercise-french-12314.php
I am frequently impressed by the carefully selected, thoughtful French sentences. This one is no exception.
Loss is an unavoidable part of life. It is transitory by its very nature. "Nothing lasts forever", as some like to say. "We would have been happy." While some have complained that this a "sad" or "unhappy" sentence, in reality it simply reflects a basic fact of our existence: impermanence. While triggers to earlier losses can be painful, the intent of the course obviously is not to upset us. Our losses too shall pass, after all. Perhaps this is why "attachment" is understood as being a path away from happiness.
Let's stay well. In various languages.
Ive found a lot of upsetting sentences in this brilliant course. The sentence authors may be depressed in the cold winter in Canada. I wrote to them to please lighten up the subjects because this course is wonderful therapy otherwise. They hired new writers, but nothing happy yet. I shall write them again.