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.

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

Words just get us into trouble.
Plural

The boot slammed and the driver returned.

Singular