do u think there can be another part of the movie?

There was a large amount of the book that never made it into the film, such as the journey through the Old Forest and the Barrow Downs, and the Scouring of the Shire. There are also substantial appendixes in the book, some relating to the future, but if you keep true to the original, nothing really bad (cinematic) happens. You could make films based on The Silmarillion though.

Tough. tough. I dont think it can be done. The first 3 parts are pretty usual. Evil is born. Good kills evil. A movie just to show how the kingdom is prospering has nothing big about it. All 3parts are directed about how good kills evil. The fourth part will be outside of this focus, I think.