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: The realisation gives her host thanks , promising to return and finish her work with the roof .

SOLUTION: Changed

PROBLEM: It was on a swivel base , operated by a crank at the left-hand side .

SOLUTION: Original

PROBLEM: " He was talking to me and I thought it would be a shame if all those stories weren 't preserved . "

SOLUTION:
Original