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: Its charcoal grey suit looked to be made of interlocking plates of some hard material and it was perhaps half the average size of a human .

SOLUTION: Inversion

PROBLEM: It took all of her concentration to remember all the flight checks before take-off , but the instructor coached her .

SOLUTION: Original

PROBLEM: They wouldn 't believe me , but I tried to inform them that you weren 't being harmed .

SOLUTION:
Inversion