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: Strangely, their full garb that was perfectly natural in 1831 also seemed natural for standing in the middle of Schuylkill River Park.

SOLUTION: Singular

PROBLEM: The monitor's beeping dove from a constant beep to deep electronic thuds.

SOLUTION: Singular

PROBLEM: " Ahhh, here you are, " Ferry said.

SOLUTION:
Singular