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: Instead of pinching his nose , he 's smiling at us .

SOLUTION: Original

PROBLEM: Humiliation threatened , so I quickly gulped the rest of my drink and reconsidered the bartender .

SOLUTION: Original

PROBLEM: Using the tip of a scalpel , he pointed to one of the larger nodules , about the size of a pea .

SOLUTION:
Original