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 slouched and rubbed the bridge of her nose .

SOLUTION: Original

PROBLEM: " Oh they were , " he owes me .

SOLUTION: Changed

PROBLEM: Just a large open field ahead , that looked as if it had been contaminated by an unnatural disaster .

SOLUTION:
Changed