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: " Only girlfriends do that. "

SOLUTION: Plural

PROBLEM: " This fellow went on.

SOLUTION: Singular

PROBLEM: The knights, captives and hooded mage all halted.

SOLUTION:
Plural