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 Undead Guardian himself appeared to rock on his heels.

SOLUTION: Singular

PROBLEM: Her tutor never even knew the difference.

SOLUTION: Singular

PROBLEM: The defense is blitzing.

SOLUTION:
Singular