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: My fingernails scraped against granite.

SOLUTION: Plural

PROBLEM: Her designs were good.

SOLUTION: Plural

PROBLEM: The university's gates had burst open and now the angry mob was in the grounds and hammering on the walls.

SOLUTION:
Plural