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: They were not aggressive in any way , but the guards were looking at her nervously .

SOLUTION: Inversion

PROBLEM: That was probably just a hoax , but a few of them might look like people .

SOLUTION: Inversion

PROBLEM: She checked her messages and her phone vibrated .

SOLUTION:
Inversion