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 spine straightened until the woolen blanket fell from her shoulders.

SOLUTION: Singular

PROBLEM: His concentration since Iseo left Compostela fell completely to his training.

SOLUTION: Singular

PROBLEM: Romulus took off running across the grassy lawn of the deserted park.

SOLUTION:
Plural