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.
--------
Question: It wasn 't a nice smile , and he smiled then .

Answer: Inversion


Question: Then he dropped the truck into first , and the truck 's engine caught with a throaty bellow .

Answer: Inversion


Question: I left the eastern United States after that , and I haven 't been back .

Answer:
Original