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: Under his fingertips, he felt her pulse quicken as something loud crashed off in the direction of the stairwell, echoing down the corridors.

SOLUTION: Singular

PROBLEM: We did our duty.

SOLUTION: Singular

PROBLEM: He looked good grinning or I should say, even better, so I sighed.

SOLUTION:
Singular