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: Angelica focused on her fingers , playing with a loose thread on the coverlet .

SOLUTION: Original

PROBLEM: Because of this , they 're usually ranked three stars and above , " Saga explained .

SOLUTION: Original

PROBLEM: He leaned against the nearest bookcase and toppled it with little effort .

SOLUTION:
Original