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.

Names, characters, businesses, places, events and incidents are either the products of the author's imagination or used in a fictitious manner.
Plural

Their footsteps rang out on the concrete floor.
Plural

The shadowy grotto had disappeared.

Singular