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.

[EX Q]: " You 've improved your weaponry .
[EX A]: Original

[EX Q]: The other students were determined to master the representative and then never use it again .
[EX A]: Changed

[EX Q]: Excerpt from Order of the Rose : Black Petal ( Book 2 ) ... Horses could be heard behind them as they approached the half completed bridge .
[EX A]:
Original