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.

He looked at his partner , and they left .
Original

There were about fifty students in the class , and she hadn 't spoken up during his lecture .
Inversion

Sonia opened her mouth to speak but Callum beat her to it .

Original