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: A flat screen television fitted snugly into the upper left corner wall.

SOLUTION: Singular

PROBLEM: One agent, looking at the incoming stream of text messages, says, " They found a cell phone jammer and disabled it.

SOLUTION: Singular

PROBLEM: The large letters' Max Packaging Co.' were in black, on both sides of the building.

SOLUTION:
Plural