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: You 've certainly learnt a lesson , the submarine will be very interested in you . "

SOLUTION: Changed

PROBLEM: My tongue flicks out and runs inside her low-cut shirt and bra , reaching until it flicks against her nipple .

SOLUTION: Original

PROBLEM: He was hard and he couldn 't smother it to a typical morning .

SOLUTION:
Changed