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

SOLUTION: Singular

PROBLEM: The rows of houses like headstones in a cemetery.

SOLUTION: Plural

PROBLEM: The ice dragon heard and understood.

SOLUTION:
Singular