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.

She knew it , but it still astounded her .
Original

I can 't be certain , but he told me he thinks it 's to do with the Collars .
Inversion

I rolled my eyes to him , but he couldn 't see because I had my back to him .

Original