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: Heather's attempts at getting him to listen never worked.

SOLUTION: Plural

PROBLEM: The thin slats broke and the crate came apart in my hands, but his grip relaxed and he collapsed to the ground.

SOLUTION: Plural

PROBLEM: Only the younger ladies held out any hope that Alexandra would be the first female to resist the " irresistible " Duke of Hawthorne.

SOLUTION:
Plural