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: The tube ran up to a bag of clear liquid hanging over Haven's cart.

SOLUTION: Singular

PROBLEM: Like the trickling of a river, her race began to manifest and walk toward her.

SOLUTION: Singular

PROBLEM: The colonel only said, " Humph, " and motioned to the guard.

SOLUTION:
Singular