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: Her tutor never even knew the difference.

SOLUTION: Singular

PROBLEM: The nurses gave them a lengthy list of places to try.

SOLUTION: Plural

PROBLEM: However the weakness lies in the definition of these words.

SOLUTION:
Singular