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: It just seemed much more fun when all the bystanders participated .

SOLUTION: Changed

PROBLEM: The space felt less protective than it was imprisoning .

SOLUTION: Original

PROBLEM: No adjustments were needed for wind as the air was still .

SOLUTION:
Original