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 adrenaline was spiking again, rushing through her veins like an awakened river.

SOLUTION: Singular

PROBLEM: The countess lifted the bowl from Madeline's arms.

SOLUTION: Plural

PROBLEM: said every adult save Americus, who had stopped in his searching and said, " Yes. "

SOLUTION:
Singular