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

Plans, ideas, were racing through his head.
Plural

Inside, thousands of soldiers were gearing up.

Plural