TASK DEFINITION: In this task you are given a sentence with one coordinating conjunction (for, and, nor, but, or, yet, and so). You must judge whether the order of two coordinated clausal conjoints have been inverted or not. Inversion would result in the sentence sounding unnatural. Label the instances as "Original" or "Inversion" based on your judgment.
PROBLEM: He conceded a step and his mouth fell open .

SOLUTION: Inversion

PROBLEM: I had my part to play and they had theirs .

SOLUTION: Original

PROBLEM: It had been ten years and he had changed in ways that I could not have imagined .

SOLUTION:
Original