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: All the bearded hunter could do was stare wide-eyed.

SOLUTION: Singular

PROBLEM: " There's no hardship. "

SOLUTION: Singular

PROBLEM: The mattress dipped as he scooted closer.

SOLUTION:
Plural