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: The senator was a skeptic, always has been.

SOLUTION: Singular

PROBLEM: My higher functions offer splendid regulation of my aqueous economy.

SOLUTION: Plural

PROBLEM: There was a mumble of excitement and the pace picked up in anticipation.

SOLUTION:
Singular