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: " Love's not necessary to a well-matched marriage, " Victoria said firmly, " but it certainly doesn't hurt.

SOLUTION: Singular

PROBLEM: Her latest release, Jumping Ship, is a dedication to her country of birth and an introductory novella to the Island Hopping Series.

SOLUTION: Singular

PROBLEM: " No birthmark could look that... much like a person, especially not one we - Hey !

SOLUTION:
Singular