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: Who set up the bombing ?

SOLUTION: Original

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

SOLUTION: Original

PROBLEM: They reached a crescendo and stopped all at once .

SOLUTION:
Original