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: If I worked fast enough, adrenaline put up a wall between me and my throbbing headache.

SOLUTION: Singular

PROBLEM: All their hopes and dreams lay at his feet, like he would be able to change centuries of hell.

SOLUTION: Plural

PROBLEM: The veil of secrecy clouded the booth like a drape, and he was trying to sweep the curtains open.

SOLUTION:
Singular