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 three figures clumped across the dormitory.

SOLUTION: Plural

PROBLEM: The opening strains of a Strauss waltz filled the room, and the dancers looked about in confusion.

SOLUTION: Plural

PROBLEM: A trick or two that could have been staged.

SOLUTION:
Singular