TASK DEFINITION: In this task, you are given a sentence. You must judge whether a single noun or verb has been replaced with another word with the same part of speech. The inversion would result in the sentence sounding unnatural, So unnatural sentences will be considered changed. Label the instances as "Original" or "Changed" based on your judgment.
PROBLEM: She had been trying to narrow down a new definition , mathematically stated , of quantum probability .

SOLUTION: Original

PROBLEM: " I knew that establishment was being filmed ; only a fool wouldn 't expect those rooms were videoed .

SOLUTION: Changed

PROBLEM: Watching her from a few steps back , I was amazed at how different she looked from the sad narrative of last night .

SOLUTION:
Changed