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: Lena's posture improved as she spoke.

SOLUTION: Singular

PROBLEM: How did the other board members not know what Neilson truly was ? "

SOLUTION: Plural

PROBLEM: " The villagers believe the river was poisoned. "

SOLUTION:
Plural