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: Light footsteps on the stairs woke me, what felt like seconds later.

SOLUTION: Plural

PROBLEM: The opening strains of a Strauss waltz filled the room, and the dancers looked about in confusion.

SOLUTION: Plural

PROBLEM: Yet my instincts said that the less she knew about what I'd discovered, the better off I'd be.

SOLUTION:
Plural