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: Her eyelids flutter and a small smile tilts the corners of her mouth upward.

SOLUTION: Singular

PROBLEM: The timbre of the engines climbed, and the Bell accelerated to its maximum speed.

SOLUTION: Singular

PROBLEM: His colleagues didn't seem to be paying him much attention.

SOLUTION:
Plural