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: Things were looking up, but it all took a lot of energy.

SOLUTION: Plural

PROBLEM: I could make out a delicate tracery in red and gold, individual tongues of flame outlined in jagged black.

SOLUTION: Plural

PROBLEM: The reflection of the mirror John was using captured the scowl on his mother's face.

SOLUTION:
Singular