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 fights were widespread and included both high schools and colleges.

SOLUTION: Plural

PROBLEM: Alexis headed back to her room.

SOLUTION: Plural

PROBLEM: A young widow, Anne Marie had adopted the girl after volunteering at a local grade school.

SOLUTION:
Singular