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: If he spun the wheel, the metal bars would shift inward a few inches, clearing the welded braces on both sides of the door.

SOLUTION: Plural

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 contents of my purse were still there.

SOLUTION:
Plural