I think that your assignment is asking you to film something. Your teacher is leaving it up you to decide how to make that video. What it's saying is you can use one of the example ideas or come up with your own.
Answer:
This passage serves to inform people about Yellowstone National Park and it's features.
The sentence that had correct sentence structure is
Before we were able to get financing we had to have the house appraised by independent appraiser
To prevent from succeeding.
The helping verb is <u>have</u>, as it shows a continuos tense.
