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: My teacher shifted uncomfortably.

SOLUTION: Singular

PROBLEM: " Twenty pairs of leather boots ?

SOLUTION: Plural

PROBLEM: The suns were glowing in the pinkish clouds, at odds with each other and casting two shadows.

SOLUTION:
Plural