TASK DEFINITION: In this task you are given a sentence. You must judge whether the object of the main clause is singular(like: apple) or plural(like: apartments). Label the instances as "Singular" or "Plural" based on your judgment.
PROBLEM: Then they noticed her reluctance to leave the farm.

SOLUTION: Singular

PROBLEM: Even the hospital was destroyed, the top three floors sheared off.

SOLUTION: Plural

PROBLEM: He saw three dolphins move elegantly through the marina waters, and then head back out to the open sea.

SOLUTION:
Plural