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]: Now , more then ever , she was determined not to shirk her class work .
[EX A]: Original

[EX Q]: After he 'd heard her weeping and later discovering the shredded lettuce , he had thought she already had , albeit briefly .
[EX A]: Changed

[EX Q]: " There are those working on a plan to infiltrate their secret base . "
[EX A]:
Original