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 shadowy grotto had disappeared.

SOLUTION: Singular

PROBLEM: " Almost drowning was pretty scary, huh ? "

SOLUTION: Singular

PROBLEM: Still, my instincts insisted that something was wrong ; the buzzing continued.

SOLUTION:
Plural