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: How did the other board members not know what Neilson truly was ? "

SOLUTION: Plural

PROBLEM: " When is your employer due ? "

SOLUTION: Singular

PROBLEM: This crate has not even been outside.

SOLUTION:
Singular