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: " What about your sciences ? "

SOLUTION: Changed

PROBLEM: The Big Man pointed to a couple elves who 'd spent most of the trip napping in the back of the rainstorm .

SOLUTION: Changed

PROBLEM: The Air Force is doing likewise with a number of buyers , especially in the Mideast . "

SOLUTION:
Original