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 twig snaps behind me.

SOLUTION: Singular

PROBLEM: Tara's unexpected career had taken off, growing solely by word of mouth.

SOLUTION: Singular

PROBLEM: As each cell was released, the nonsensical colors took shape as a green forest in the dark of night.

SOLUTION:
Plural