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 'm not worried about my legs , " he said , " but I don 't want to be paralysed all my life . "

SOLUTION: Original

PROBLEM: She had been trying to narrow down a new definition , mathematically stated , of quantum probability .

SOLUTION: Original

PROBLEM: He slings a backpack over his shoulder and leaves the house .

SOLUTION:
Original