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: But her efforts seemed futile.

SOLUTION: Plural

PROBLEM: Moses thought for a moment, as he pushed the remnants of his meal around his plate.

SOLUTION: Plural

PROBLEM: The boom of the shot was startling in the forest, but no birds took flight.

SOLUTION:
Singular