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.

We left his room , and Jonah grabbed up keys .
Inversion

It was the sweetest , craziest , most romantic thing I 'd ever witnessed , and I didn 't know what to make of it .
Original

His fingers tightened reflexively against her ribs and he had to concentrate so as not to snap them .

Original