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.

Q: He chugs the full content in one go while I stand rigidly , fuming .

A: Original
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Q: ' Hold quite still or I 'll gnaw you ! '

A: Original
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Q: Unable to keep still , she bucked and writhed over him , squirming , copying until she knew not what she did .

A:
Changed
****