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: You're no threat to me, his posture said.

SOLUTION: Singular

PROBLEM: The differences between straight and gay people are just in who they love.

SOLUTION:
Plural