Answer: You can write the end because there are so many different endings, and it probably has to match the one you read. I hope this helps!
I looked around. Anything would do, I'm starving! I sneaked around town all day, looking for any food I could find. Nothing. Terrorizing people didn't work either. When I was about to give up, I saw a glimpse of a little piggy walking with a barrel of straw. How exciting! I was about to pounce when I saw two others. This is my lucky day! I just couldn't figure out what they were up to. Even though I was still hungry, I left them alone for a while, because I knew I had to wait for the right moment to get my meal. I spied on them for the next few days, and it appeared that they were building something. Three things, actually.
It looked like each of them were building shelter, each out of different material. Straw? Too easy. Wood... easy to shake. Brick? Now that's a challenge! You're supposed to be protecting yourself from the Big Bad Wolf, now! When the three pigs were done building their little homes, I decided it was a good time for a visit. I roared and growled while I ran to their little shacks.
I stopped in front of the first house; it was made of straw. This lazy pig didn't work very hard. "Little pig, little pig, let me come in." The pig said, "Not by the hair on my chinny chin chin!"