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: After what seemed an age, the actor sat up.

SOLUTION: Singular

PROBLEM: Red taillights suddenly pierced the darkness, and a black, full-size SUV pealed away from the curb.

SOLUTION: Plural

PROBLEM: Her specialty was surveillance, not undercover work.

SOLUTION:
Singular