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 heavy gloom fell over Reuben.

SOLUTION: Singular

PROBLEM: Evan clutching his favorite blanket with quilted airplane squares, the edges now ragged.

SOLUTION: Plural

PROBLEM: The tightness had loosened in my chest, though until he spoke, I had not entirely realised that laughter had bubbled up in its place.

SOLUTION:
Plural