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: It takes very little energy , and it 's an easy way to motivate people to do things .

A: Original
****
Q: Your nightly search might be merely a manifestation of the stress of what happened to you that day .

A: Original
****
Q: She had rarely seen the old instructor less sure of himself , and it fuelled her anger .

A:
Original
****