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: You can 't really drive off that many birds , but I tried to beat them off with my hands .

SOLUTION: Inversion

PROBLEM: I tracked them down through the woods , but they had a car parked at the edge .

SOLUTION: Original

PROBLEM: If something really was wrong , she needed to know I was concerned about her , but I didn 't want to pry .

SOLUTION:
Inversion