This document is a reference tool that holds all the endings and irregular rules for the preterite tense.
There are two different versions in here, one where you can have the class fill it out together as guided notes, OR a document where it is already filled in and can be used ready to go.
The tricky part is the printing (which I even screw up some times)
For example, take Page 1. Print it out on two separate sheets of paper. Then flip on of the sheets around so it is facing the opposite direction. Then resend it through the copier double sided.
When you go to place it all together, space the titles apart on the bottom and then fold it over 2/3rds of the way up. Look at the thumbnail before you fold it. It sounds harder than it is, but once you have it down, it's easy to do!