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: He looked at his partner , and they left .

SOLUTION: Original

PROBLEM: The faint smell of alcohol clings to him , and his khakis are wrinkled .

SOLUTION: Inversion

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

SOLUTION:
Inversion