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: Terror seized him at the thought of Nadia out there on the water alone - No.

SOLUTION: Singular

PROBLEM: " Only girlfriends do that. "

SOLUTION: Plural

PROBLEM: One after another, the pricks came with constant, never-ending stabs like a swarm of bee stings.

SOLUTION:
Plural