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

SOLUTION: Singular

PROBLEM: Only a slight wheeze escaped his lips -- no cry of pain or surprise, as he hurtled toward the short wooden railing.

SOLUTION: Singular

PROBLEM: Werewolves walk the earth.

SOLUTION:
Plural