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: I resigned , and later I turned in a report to the FDA with all this documentation . "

SOLUTION: Original

PROBLEM: Ian , with his Bug eyes , had invited me to visit him in St. Louis .

SOLUTION: Changed

PROBLEM: I reach down to my backpack and fumble to unzip it with my stiff fingers .

SOLUTION:
Original