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 shadowy grotto had disappeared.

SOLUTION: Singular

PROBLEM: These creatures are often crazed and power-hungry.

SOLUTION: Plural

PROBLEM: They are, as she puts it,' a matched set' now.

SOLUTION:
Singular