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: Things could have gone a lot worse on the island. "

SOLUTION: Plural

PROBLEM: A flat screen television fitted snugly into the upper left corner wall.

SOLUTION: Singular

PROBLEM: It had to be one of his most popular tunes because the moment the DJ announced it, the fans started screaming non-stop.

SOLUTION:
Plural