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: Washoe's progress with ASL was rapid ; by 1971, she had a vocabulary of 160 signs, which she used in conversation.

SOLUTION: Singular

PROBLEM: The copper haired girl sat up chuckling.

SOLUTION: Singular

PROBLEM: The supplies were beginning to dwindle and the looming run was starting to weigh heavy on everyone's mind.

SOLUTION:
Plural