TASK DEFINITION: In this task you are given a sentence. You must judge whether subject of the main clause is singular or plural. Label the instances as "Singular" or "Plural" based on your judgment.
PROBLEM: The slow revealing of her expanse of skin nearly caused an explosion in his gut.

SOLUTION: Singular

PROBLEM: His footsteps echoed like a death knell when he walked away.

SOLUTION: Plural

PROBLEM: Aside from a few early passengers, the terminal was barren.

SOLUTION:
Singular